Today my parents brought over A.J., there 4 month old male lab. Tyson is 14 months and it was the first time they met. After an hour or so of playing, tyson decided to start humping A.J., which he's never done to another dog but did it a couple times to us when he was like 8 months. We trained him not to do that and he hasn't done it since. We'll at first we thought it was just tyson doing the whole dominate thing and pulled him off. Then he went back a few minutes later and started doing it again. Now, not to be vulgar, but when he went back again, his "red rocket" came out. All of it. It was funny but gross. Was he aroused? I"m really not sure what my question is but was wondering if this happened to anybody else. I could see if was a female dog, but is wasn't. Thanks for any advice.
They can also do this and still keep playing...it's not necessarily a bad thing.