Today I washed all of Reesie's bedding and so I had given him just a towel to put down in his crate while the rest of his stuff was drying. He was not crazy about just a towel. Well, tonight I got his little bed out of the dryer and put in on the floor next to his crate while I was getting ready to put it in. He was so excited to see it. He was hopping and chewing it all over, and then all of the sudden he started humping it!! I was so shocked! He is only 11 weeks! Is this normal??