seen the humping behaviour in many litters as the pups are playing about its as natural as mouthing or leg pulling, seen plenty bitch pups doing it as well, smallest bitch n litter doing it too the largest dog pups looks funny, and yea it does seem to happen when one looses interest in play when I reflect on it,
not a massive fan of crating myself, but some say it gives them a calm space of their own, my dogs have that its called the house I'm lucky the wife practical and knows the odd bit of damage is inevitable when you have pups, but to be fair, give them plenty of time and exercis