male and dog

Hey all, recently took a rottys knot. It’s been a couple weeks and I have a burning feeling along with some swollen lymph nodes. I recently did a full std check and I’m all clear. Anyone else experience this?

First of all sorry for my bad English I have two half German shepherds, and I usually have sex with them (I receive), but I keep the knot out because it scares me. The size and length they can get , it's safe to take them all? I don't want to get hurt or hurt them. And I don't know how much...