I just have a quick question. Today my lab was laying on the ground and his tail was still wagging around like usual and I look over and his rear end looked a little swollen. So I grabbed his tail and lifted it up a little and he growled at me. I kind of jumped back because there isn't a mean bone in his body and he caught me off guard. I yelled no at him and left it alone. Just a few minutes ago he was sitting next to me and I was petting him again, and touched his rear legs and he did it again. This time I grabbed him and gave him a firm no. He is six months old and I'm curious if his "jewels" are sore or his anal glands need to be taken care of... Kind of odd, he is a SUPER happy dog. This just kind of caught me off guard. I know there are some dogs who don't like their tail touched but even if this is the case I want to nip this problem in the butt before some little kid grabs it.