How to stop my pup from being a perv

Hi guys,

I’m not sure which section to put this in, but I thought this might be the best fit. Puck has some really weird behavior when it comes to other dogs. He licks their privates obsessively. I’m not talking about a sniff and a little lick to say hi, he will sit there and lick ANY dog until I tell him to leave it or pull him away. He doesn’t have any kind of preference. He’ll do it to boy dogs, girl dogs, fixed dogs, intact dogs, basically ANY dog! He is fixed, we got him neutered when he was about 6 months old (my vet wouldn’t do it any earlier than that, I don’t know why). He didn’t do it too much when he was little, but it seems to have gotten progressively worse since he got fixed.

We go to the local dog park every other night and he will do it to any dog that stands still long enough. Some dogs turn around and growl or snip if I don’t pull him away—no dog has ever been mean to him, just a “Hey leave that area alone already!” kind of thing. However, he doesn’t seem to pick up social cues and when a dog growls at him, he backs off for two seconds and then goes right back to if (if I let him). I have to watch him very carefully and pull him away. Like I said no dog has ever actually tried to hurt him, but I’m worried one day he’s going to get into trouble with it.

He does this weird obsessive licking of other dog’s privates, but it’s rarely accompanied by humping. The only dog he makes a humping motion to is his girlfriend at the dog park. He will lick her more than any other dog. He gets under her legs (she’s a heeler mix, and much taller than him) and starts to lick her and humps the air. She doesn’t even seem to notice, she’s just a pup about 10 months old and really sweet. She just turns around and starts to play with him. She is spayed, so I don’t understand why Puck goes after her like this.

I try to pull him away every time he does this and make him sit by me for a few seconds to calm down before he gets to go back and play. He never goes farther than 5 feet from me at the dog park, so it is very easy to grab him back. He doesn’t normally go out of his way to do this, but if another dog is close and/or trying to smell him to say hi, he goes to town. Puck is a very submissive dog in general. He’s been around lots of other dogs and lets them take his toys, treats, everything. In fact at the dog park if I throw the ball for him and another dog runs after it too, he’ll let the other dog get it and then just look at me all sad. Has anyone ever had a dog of any kind that has done this? Or have any idea why Puck might do this? Or any tips on how to make him stop? It’s really embarrassing to have to pull Puck out from under a dog because he’s just sitting there licking him/her. Luckily Mindy’s (his gf at the dog park) mom is very understanding and neither her nor Mindy mind. It’s just really really weird and embarrassing for me, and I’d at least like to know why. Any info or advice is appreciated!

~Puck and Jen