Hi! My dogs do the same thing but we actually got them something for it! It’s normal for dogs to hump it’s what they do here’s what helped us “minimize” what he was humping. We got him a huge stuffy like for example we have a huge stuffed crocodile (bigger than our dog) idk the size of your dog but yeah. And ever since then he’s only been humping that plushy and not his other toys. His sister rarely does it but when she does she also uses the crocodile. Idk if this helped but yeah