Sammi was a year old on 11/14. Three days later I noticed a bum on his side. Am going to the vet Thursday. Scared to death!!! I've had older dogs with "fatty cysts"...but the first vet said it was a tumor and we should wait and see if it grows before we put him under anesthesia. The secod opinion is this Thursday. I can't find any "prone to" postings on any websites...any ideas?