I just got a puppy mutt. He is a border collie lab mix. Thats wat the foster parent said but i am seeing pitbull in him. When we got him at about 2 months his ears were floppy and went down. Now they are starting to curve back permanetly. I was looking at pictures of pitbulls and their ears look the same way that his do. Except only one ear is doing it. I'm thinking that they're probalbly going to stay curved back when he's older but i just want to know why they do that. because He is sooo much cuter with floppy ears.