Actually, the vet office we go to has 5 docs and we called just before closing when we noticed the lumps. Only one doc was left on duty and she said she had never seen anything like this before and with the help of a vet book and a phone call to another doc, made the diagnosis. The info I found on the web did not mention the condition as being contagious, said it was common in puppies and usually goes away in "several weeks" I found this at peteducation.com