Oh dear. Nero (Labrador puppy) is growing up. He just tried to hump Miley (adult Labrador.) I realise this is a dominance thing rather than a sexual thing & he's trying to assert his place in the pack. I hope there aren't going to be fights now.
She's still much bigger than him but she's middle-aged and a bit arthritic and he's young and fit. I suspect if he has a mind to be top dog, he will achieve that, if not now, in the next few months. Miley won't know what hit her. Prince was happy for her to be the boss.