I have a male golden retriever and he's just over a year old. I noticed this lump on his belly near his penis. He doesn't appear to be in pain and it didn't bother him when I was inspecting it. I've never noticed him biting it or anything but he often licks down there so it's not something I'd see as unusual if he was.
He sleeps indoors and he is on a lead most if the time when we go for walks. I could probably pop this with a pin but I'd like to know what it is before I do anything.
It doesn't look sore and it's very soft almost like it's filled with fluid. He has had similar, but much smaller lumps in the past and that he usually pops and a yellow liquid comes out. The vet said they are just from nettles. This one is big and he has yet to pop this one which has me more curious.