Please note that it is perfectly acceptable to have a Pembroke Welsh Corgi that is black and tan with no white, but a Pembroke Welsh Corgi that is black and white with no tan present is a mismark.
He went up to it, and wanted to wake it; but behold, from under the cot out jumped a little black and tan terrier dog, and began barking and snapping at Tom, and would not let him touch the cot.