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Originally Posted by wildcard  I think it is more likely that the the gene that causes parti color in yorkies (whether it happened in the development of the YT or more recently) is from a breed or precursor to a breed where you regularly see piebald as a coat pattern. This is an interesting article on the various alleles involved in coat color genetics. Coat Color Genetics
I am not sure why adding in a maltese here or there would cause parti color... |
Maltese are an example of extreme white piebald spotting, they're basically one big white spot.