http://www.geocities.com/Petsburgh/Park/3905/coatcoloursinchis.html Harlequin (Hh) and merle (Mm) are inherited separately but must work together. The only hope is to never breed two merles together. body,td{ Merle's are such a joy to have and it is truly a gorgeous pattern. Breeding Business, 2015-2022 All rights reserved. Phaeomelanin is not affected by merle. When thesehidden merles are bred to other merles (accidentally or unknowingly), thus doubling up on the merle (M) gene, the result (if the puppy inherits one M--merle--gene from each parent) will be a puppy with two M genes--a homozygous merle. Also known as double merles, or MM. Chihuahua Club of America - Merle Guidelines. My solution is, why not label it within the pedigrees? Recessive red dogs are affected by merle but patches are subtle or not visible at all. Click on the link below: Please be advised that if you are still interested in getting a merle, that you could end up with a dog that has deafness or hearing issues, not to mention a questionable pedigree and usually a big Chihuahua. Another much more serious and important issue is the higher occurrence of health problems in Merle Chihuahuas. Color pedigrees will not help since many puppies change color as they grow and are not registered correctly. This is what the Merle Chihuahua breeders DO NOT tell you. When two dominant M alleles are present the result is a double merle dog. You can see the Merle has faded and the Brindle will too as he gets older. Others say it is the effect of age on a very poor gunpowder flash photograph. The Merle gene itself is a dominant trait, which means one of the parents MUST be a Merle for the gene to be expressed (or show up) in a puppy. Also called "Double Merle". Negative m will always be passed on to the offspring. You can still get deaf and blind puppies from this type of safe breeding. The merle allele M is dominant and the non-merle allele m is recessive. merles, which are often NOT recognizable as merles as adults(though when bred to black tris, they will produce blue merles, thus identifying one parent as a hidden merle). Clear sable (ay) is another gene that hides merle patterns. The In tests, the cryptic allele is written as Mc. This means that a cryptic merle dog still carries a dominant M and can technically produce double merles if bred to a merle. The puppy pictured is Ody. Other problems such as eye problems were also apparent. Sometimes only a pup's tail is blue, so when it is docked there It is not the same as co-dominance. Cryptic (phantom) merles are merles that have no visible blue research this pattern before I go any farther. This means that one sable allele is enough for the gene to be expressed. She did not. a blue merle. French Bulldogs, English Bulldogs, and Pugs now come in a merle pattern but these dogs are not purebred. Homozygous refers to the inheritance of the same allele from both parents. When thesehidden merles are bred to other merles (accidentally or unknowingly), thus doubling up on the merle (M) gene, the result (if the puppy inherits one M--merle--gene from each parent) will be a puppy with two M genes--a homozygous merle. Merle is frowned upon by many breeders because a lot of the time they are bred incorrectly and are not considered purebreds. Please click on thelink below. merles, which are often NOT recognizable as merles as adults(though when bred to black tris, they will produce blue merles, thus identifying one parent as a hidden merle). -->. Ultimately, if you buy a Merle Chihuahua, you are probably not getting a purebred Chihuahua, just a mixed breed (even though it might actually have registration papers). But it is limited merles the moment I saw one. The practice is controversial. You can see her spots are a light grey. Breeding merle to merle can produce double merle dogs. Around half of the resulting puppies are merle because these dogs will produce both M/m and m/m puppies. to be used for general knowledge only. The double merle pattern is directly associated with ocular defects, auditory defects, and skin exposure that can lead to an increased risk of sunburn. Breeding a Merle, to Merle can result in deaf, and blind puppies. Merle is a heterozygote of an incompletely dominant gene, this is a type of genetic formula. that little patch of blue on his elbow. While these dogs can still live fulfilling lives, responsible breeders will work to prevent cases of poor welfare in their puppies. As quoted from Genmark, makers if the merle genetic blood test www.genmarkag.com/canine_faqs.php: Health Problems Associated with the Merle Allele Both heterozygous merle (Mm) and homozygous double merle (MM) dogs may exhibit auditory and ophthalmic abnormalities including mild to severe deafness, increased intra ocular pressure, ametropia, microphthalmia and colobomas. There is a huge war going on in the chihuahua breeder/exhibition world over this issue. A friend of mine on the edge of his ear. In fact, in would be better for merle to be a disqualified colour in all breeds. Deafness results from the degeneration of the cochlear blood supply. Double merle dogs are at a greater risk of health problems than single merles. The Motion to change the Chihuahua Standard to add a disqualification for the merle colour has passed at the Canadian Kennel Club. When the dilution gene is inherited (ddHhMm) the harlequin patches become blue. Phantom, cryptic or hidden merles may also be caused by a different mutation labeled as Mc. Miette is an example of the same type of reduced merling in self black. This makes merle heterozygous. One-off litter or professional dog breeder? (800) 474-7044 (order code 62539) 19.95 + ship. Well, unfortunately, unlike other colors, the merle gene acts on a color and lightens and whitens certain parts of it (creating patches) the whitening is what causes defects. This can happen when you breed a Merle to a Brindle but it can also happen if you breed a Merle to a solid color that carry's the Brindle gene. black tris produce a litter that contains merles as well. Australia (banned registration of merles), New Zealand (banned registration of merles), Canada (Merle is now a DQ in the Chihuahua standard), Great Britain (Merle is now a DQ in the Chihuahua standard). found to be true in collies. ^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^, Mrs. Harmar was alsoon the committee for saving the Xoloitzcuintli (Mexican Hairless Dog) in Mexico and in 1956 imported the first ones into England since 1911. Perhaps the tendency This means that a double merle affected dog is more likely to suffer from congenital deafness. There is no mention of this color what-so-ever in any Chihuahua breed book, or genetics book that lists certain color patterns that are in the Chihuahua breed. The only merling on his whole body is It better to protect your double merle dogs more sensitive skin from damage before it occurs. Areas on his sides that Also, a large majority of Merle Chihuahuas are consistently very big, in the 6 to 10 lb range, which is very unlike a purebred Chihuahua and is probably a result from a throw-back to the mixed breed dog that was introduced years ago to get the Merle Chihuahua. A lot of people tend to call a black Merle a Blue Merle's. Merle's bred incorrectly can have a lot of health issues. In this case, it refers to the presence of a dominant M allele and a negative m allele. Merle genetics toward the end of the page, about 3 easily understood paragraphs. Presumably, this is because of the suppression of melanocytes by the merle gene itself. The recessive red allele (ee) hides some merling. is a minimal blue merle. Merle is a pattern that can come in many different colors. Often, when a dogs coat is whitened, the pigment inside of their ear and on their eye, also whitensmaking the dog DEAF and BLIND as the nerves endings atrophy and die. Her famous "Aztec"affix appears in Chihuahuas, Japanese Chins, Pomeranians, Shih Tzus and American Cockers. The Inheritance of Coat Color in Dogs, by Clarence Little, when listing colors for Chihuahuas, does NOT list MERLE. Gibson is a very handsome blue merle with the least merling December 2015. Is this really for the betterment of the breed? Whether that dog is a nicely spotted dog or is a lightly spotted dog that fades with time into a sable or a solid color we won't know. Congenital sensorineural deafness is directly associated with the merle gene. Even if the History And Genetic Influence In Different Dog Breeds. When two merle patterns (M/m) are bred to each other, 25% of the puppies will be homozygous for merle. Breeding Show Quality Chihuahuas since 2010. Healthy dogs & cats takevitamins! Although there is a higher prevalence of deafness and blindness in merle dogs, not all merle dogs suffer from these problems, and the majority dont. All rights reserved.
, http://www.ashgi.org/color/eyedefects.htm, http://www.geocities.com/Petsburgh/Park/3905/coatcoloursinchis.html, http://www.kelpies.caviesrule.com/about.html, http://www.kandeechihuahuas.com/merles/ftlowille.html, English Kennel Club information on merle Chis. Please click on thelink below. http://www.cipinet.com/banners.html, Healthy dogs & cats takevitamins! This breed has a lower incidence of ocular abnormalities and deafness associated with the merle gene. The pro-merle breeders want to improve upon the situation at hand, and try to fix the issues they can, but they can't fix this genetic issue that lies within the pattern itself. If it receives the m gene, it will not be merle. Merle coat in dogs has been introduced into a range of other breeds. The Chihuahua standard reads, "any color--solid, marked, or splashed." Iris coloboma: a cleft or notch in the iris. These merle dogs are called cryptic, phantom, or hidden merles. page. The M (merle) gene acts on whatever coat color the puppy has. content, products, and resources as well as animal education; the information and content on breedingbusiness.com is intended Yes this is possible. This gene cannot remain 'hidden' for generations, like chocolate or blue, which are recessive colors, thusproving that it has only recently been introduced into our breed. Our team provides quality posts, in-depth articles, interviews, product reviews, and more. An excellent read for any who breed merles. The only indication of the merle allele in these cases is through blue or partially blue eyes. For example these two pictures show the same puppy at 1 week, 5 weeks, and at 3 months. My goal is to breed healthy and beautiful Merle's, which has, so far been a success. A Blue Merle will have blue spots and a blue nose. The merle pattern is labeled red or blue. The merle forms of brown (or liver) are called red although red and brown are genetically different. A double merle coat in dogs is also associated with a lack of tapetum lucidum. However, the risk is still too great, and responsible breeders will avoid producing double merle puppies. Once docked, visible blue is gone, and Our bestselling ebook helps you start and manage your dog breeding adventure from day one. The major issues stem from double merle breedings. You can see his spots are black and he has a black nose. When breeding a Red, Sable, or Fawn to a dark Merle. Some double merle puppies end up with rescue organizations as it can be harder to find them homes due to their disabilities. If it receives the m gene, it will not be merle. Chihuahuas also come in merle but are rejected by the UK Kennel Club. a normal black tri, but his tail is blue! document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Breeding Business is a platform dedicated to ethical dog breeding around the world. Tricolor dogs may look similar but typically lack the characteristic marbling of merle. Based on information about the merle gene in Dachshunds, all merles that are brought into the world have a 36.8% chance of developing some sort of hearing loss, resulting from either slight hardness of hearing to total deafness (Willis). Double merle dogs have a higher risk of deafness, blindness, and sunburn. The fact that they are deaf and/or blind will not be recognized until they are older (around weaning time), hence a decision will have to be made about what to do with them. At this time, there are already normal (single M) merle Chihuahuas which have been diagnosed by two independent veterinarians with deafness and eye problems that will lead to blindness. This percent is for puppies that result from one parent that is a merle, and the other that is a non-merle. It was, and is still, my very favorite pattern of chihuahua. That being said, some double merle dogs do not suffer these problems. Responsible breeders will test for merle when breeding these dogs to reduce the risk of double merle puppies. The Inheritance of Coat Color in Dogs, by Clarence Little, when listing colors for Chihuahuas, does NOT list MERLE. How about this dog? This results in a blending of both alleles. red merle you can see the blue very clearly. on markings). If you came here to find out if I am breeding merles, look no further. whole body is that tail. Not every double merle dog will face these issues, but a significant amount of them do, which makes the deliberate breeding of these dogs unethical. This is because it requires crossbreeding and potentially brings health issues to the target breed. don't care what anyone else thinks because I love them. to the point of approaching cryptic status. of all the examples on this page. This can be quite a surprise to the breeder, when two seemingly Breeding these light dogs to merle will result in fawn, cream, red, sable, white, etc. The fact that they are deaf and/or blind will not be recognized until they are older (around weaning time), hence a decision will have to be made about what to do with them.At this time, there are already normal (single M) merle Chihuahuas which have been diagnosed by two independent veterinarians with deafness and eye problems that will lead to blindness. It is very interesting to note that Hilary Harmar, as early as 1968, made the following reference to the merle gene in her book Dogs and How to Breed Them (p. 9) under the heading of "Lethal Genes,", "Semi-lethal genes, such as those producing bilateral cryptorchids, eventually become lethal to a breed by resulting in its becoming extinct. This is why merle is written as M/m. Incomplete dominance is when a dominant allele does not completely mask a recessive allele. for 30 (3-month supply for Chis),All content & photographs copyrighted 2004 to 2022 Liz Moore. This is because recessive red dogs do not produce eumelanin pigment, leaving them a solid red color caused by phaeomelanin. The proposed mutation is said to only occur in this breed and could be due to a shorter insertion of the m allele when compared to the dominant M allele. This includes double merles. Such breeds accepted by the American Kennel Club include: Merle pattern has been introduced to other breeds through crossbreeding. show you the arguments that led me to question my original decision, and Santana and Chester litter. Double merle dogs are far more likely to be unhealthy. Since Merles were never heard of more then 15 years ago, this color pattern has probably resulted from cross-breeding other breeds of dogs that have merles such as a Dachshund, to the Chihuahua and falsifying the purebred dog registration. There is much controversy over this photograph in the pro/con merle debate. If your double merle dog is sunburned, their skin appears pinker than normal. While many breeders admit that there are problems when breeding two merles together, they do not admit there is also a problem when breeding a merle to a non-merle which is the breeding most breeders do. The risk of breeding double merles by accident is always present. side of her face. Hopefully, with more knowledge about this pattern, breeders will reconsider breeding this color pattern. I fell in love with M/m (Merle) This dog carries one dominant M and one negative m. Either allele can be passed on to the offspring. Especially if the puppy is Longcoat. While we provide informational Double merle dogs can be more sensitive to light. It is not intended to constitute professional guidance or veterinary advice. This is not the type of gene that remains hidden for many generations like a recessive gene. This is Bruce, photo courtesy of Heike Poole of Germany. These patches are distributed all over the body. A hidden Merle is a Red, Sable, or Fawn Merle. For those who are not familiar with the merle gene, one fact is indisputable: In order for a dog to BE a merle, it MUST HAVE one merle parent, either sire or dam. 09740325), FREE 7-DAY ETHICAL DOG BREEDING COURSE. For the reason of health problems and questionable parentage, the presence of the merle pattern in Chihuahuas is being banned in many countries world-wide. has an aunt who also was born with a blue tail. Some dogs do not look to have a merle pattern but genetically are merle. It can come in Black, Blue, Chocolate, Fawn, Sable, and Red. In order to completely eliminate the risk, breeders may test for the merle gene. These puppies will be deaf and/or blind, and some will have other internal health problems as well as possibly being infertile. And Merle Haggard (on the right) is a black Merle. It will be more sensitive to touch. The blind and deaf Merle puppies on her site were a result of single merle breedings (one parent was a merle and the other wasnt), showing you can still get problems even if you dont breed Merle to Merle. These dogs can be dangerous in the wrong hands, because it makes it possible to accidentally breed a merle to a merle without the breeder being aware of it. THE KENNEL CLUB OF UK (England, Wales, Scotland) HAS OFFICIALLY BANNED MERLE CHIHUAHUAS FROM BEING REGISTERED OR SHOWN. In addition, hidden or cryptic merles can occur. chihuahua world there must be some merit behind it. since his merle status can clearly be seen and identified. The term "Hidden" is used to refer to a dog that expressed the merle gene at some point in its life, but due to conflict with other colors and/or patterns, has grown to no longer express this gene. may appear bluish are just highlights from the flash. He also has Cream points and a Blue mask!!!! Please click on thelink below. It also eliminates the risk of double merles (M/M) because only one dominant M allele is involved in the breeding. Every Great Dane carrying the harlequin gene and the merle gene has a harlequin coat. Merles can come in a variety of color patterns, including red merle and blue merle (above). Below is a link toone person's experience withbreeding merle Chis, is this really worth it? Definition of Homozygous Both parents are merle. They can also produce homozygous merles if bred to a merle. Co-dominance is when both alleles are expressed at the same time, not mixed. Take in point the case of my litter of pups pictured on this site Clara and Piper. Once this foreign gene gets into our light colors (fawns, creams, white-spotteds, etc. - Website currently Down :(, A page that very thoroughly explains the arguments against breeding merles. You notice here though that 50% of the dogs in question are not merles, even though their mother was a merle, they can't pass the pattern on because they don't have the dominant "M" gene to override the recessive non-merle gene "m". This pup I know this because Clara is a black and tan. blue there would have been has been concealed by a white marking. You should be receiving an order confirmation from Paypal shortly. In a merle to merle breeding, 25% of the puppies are double merle. Itis effective January 1, 2008! Important Disclaimer This site does not intend to provide veterinary advice. m/m (Negative) This dog carries two copies of the negative and does not appear to be merle. This refers to color, not modifiers that act on color. Kellers Cause, Amazing Aussies and Pink Heart are just a few organizations that work to rehome double merle dogs. While the Merle color can come up from genetic mutations, this is most likely not the case as it is the same gene that is also present in Aussies, Dachshunds, Shelties, etc. True cryptics are very rare, but their existence Then I realized None were completely deaf. Plan a breeding program, master canine genetics, and use the right strategies. You get 25% MM dogs with the major health issues, 50% Mm "healthy" merles, and 25% mm dogs with no merle gene at all. I immediately sought one out, and started breeding It is limited to a tiny area Laboratories such as the Veterinary Genetics Laboratory offer testing for the merle gene. Merle's are purebreds and have been accepted into AKC. You can see the Brindle going down the middle of the back and the Merle on his sides. If your questions have not been sufficiently answered, feel free to refer to our FAQs. It is inherited separately from merle. lack of visible blue could be because it is just very reduced It is not unusual for nonmerle dogs to Here, finally, is a true cryptic merle! Say Pebbles was AKC registered (she sadly is not so this pedigree is fictitious but I am moving to all AKC dogs) and say Bullet was as well. A merle coat in dogs is one of the most interesting and beautiful variations to come from breeding. Merle pattern can be masked by other genes or heavy patching. English Kennel Club information on merle Chis These membranes can be asymptomatic or can cause severe visual impairments. spots faded, even if it only has a tiny speck of blue on one eye the M goes the blue! Puppies with cleft palates, unless operated on, cannot suck and therefore die.