Question
Brown Spots
Our 6 year old white male boxer has recently obtained small brown spots on his coat. This spots appeared after being on thyroid medication for about 1 month and immediately after having a urethrostomy. Before this time he had no spots. His coat has also become extremely soft. Could the changes be from the thyroid medicine or the surgery?
AnswerThe brown spots are pigment change, however, most Boxers have the spots but cannot be seen due to being faen or brindle.
"The gene that is responsible for white markings on a boxer isn't adding colour, it is suppressing it. Or put another way, every white boxer is actually either fawn or brindle, it's just that they have a double-dose of a gene that suppresses pigment development. If your mother's white boxer is showing some fawn spots, we can probably assume that she is actually genetically fawn - with her double-dose of the pigment-suppressing sw gene causing most of her coat to be unpigmented (white).
An important thing to realise about pigment though, is that what the dog is born with isn't all of what it is going to get. That is, pigment continues to develop. It starts out from a few nodes and, normally, spreads out to cover the entire dog. We see this on pups with white markings - the markings (acutally unpigmented areas) at birth are almost always much more extensive than they are by 8 weeks when the pup is ready to go to his new home. By a year or so of age, they're usually further reduced in size. We often say things like 'the pup grows, but the markings don't' or 'the markings shrink', but actually, it is the pigmented areas that are expanding" (boxerworld.com)
Read:
http://www.boxerworld.com/forums/boxer-anatomy-physiology/130242-white-boxer-bro...
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