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Una Chica Yeye de Castro-Castalia
CMO, also called osteoarthropathy is a non cancerous growth of bone that happens in the lower jaw bone (the “ramus” of the mandible) or over the angle of the mandible and the tympanic bulla. In most instances it is bilateral, although very occasionally it can be unilateral.
The bone is dense and hard and has a rough surface that can sometimes be detected on palpation by any experienced owner. There may also be an inflammatory component at the early stages of the condition. The disease is painful to the puppy and is usually first recognized when a puppy shows discomfort while chewing or when his mouth is being examined. The bony growth can occasionally occur on other parts of the cranium, and the radius and ulna may also be involved. By casual examination, the jaw may not appear enlarged or abnormal.
The disease is most often recognized between the ages of 4 and 7 months, but it can occur as early as 3 - 4 weeks and rarely as late as 9 - 10 months. Experienced breeders and veterinarians usually recognize it earlier than 4 months of age by clinical signs or by palpation.
The disease can be treated with most anti-inflammatory drugs but long-term therapy may be required; dogs will always or nearly always recover, but the length of treatment may vary from 4 to 10+ months. At the end a natural remodelling of the jaw occurs and is generally good, and by the time the dog is 2 - 3 years old, it may be impossible to detect that the dog ever had the disease.
Inheritance of CMO had long been suspected and it is now known that it is caused by a simple autosomal recessive gene. This means that both parents must have at least one gene for CMO (i.e. they are defined carriers). In this disease, the production of an affected puppy provides the only method of identifying carriers. Although it has been known to affect basically small breeds of dogs, I have heard of some cases happening in specific Bullmastiff families and bloodlines. Therefore it is important that any breeder being aware that one of his puppies ever suffers this condition avoids repeating the same mating again and again.
Owners of dogs that may be affected by this condition should report it to the Breeder, to ensure that he becomes aware of the problem.
Fortunately I have never heard of any of my pups or youngsters be affected by this condition, but as I said previously, I know of certain dogs from other prefixes that have been treated for CMO.
(Original text written by Christina of Lima-Netto and Federico Baudin specifically for this web page and protected with Copyright. Not even whole can be reproduced not partially by any way, without Castro-Castalia's express assent in writing)
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