Sam had a hernia since the day I brought him home when he was just a pup. It was small and never became an issue. It was like as wide as a dime and didn't poke out very far at all. The vet said if it ever looked bigger, started coming out more then they may need to fix it but if not then he would be fine. My vet said they can have it their whole lives and it never become an issue. However it did end up being fixed. Samson swallowed a toy April 2010 (he was 4). Had to be surgically removed and they had to cut thru the area where his hernia was to get the toy out so it was fixed at that time. My neighbor has a boston that had a hernia since she was born. The vet didn't say it was necessary to fix it but she opted to because she worried it was going to become a problem. It got fixed when the boston was like 4 months old. This bostons was much bigger than Samson's (maybe it just looked that way because she is alot smaller obviously being a boston). Popped out bigger than the size of a marble.