Optimus has been home with us for just over a week now. He's doing great with being in his crate, he eats his food like a little monster, only poops outside, pees inside a little bit still, but one thing he does that drives me up the wall is that occasionally he'll bite onto my pant legs and just hold on. Most of the time this is after he goes outside to poop and we're walking back inside. Shaking him off doesn't work, giving him a little smack doesn't work, I literally just have to wait until we're inside and he'll let go. He has plenty of toys to chew on, why does he insist on my pants?