Ours will just freak out for no reason, Jump up and run through the house and going so fast you hear his nails digging in the carpet as he races around the house and then jumps up on something and then starts to howl, and then he is done. I also hold a balled up peice of paper in my hand and if he see's it he is like a dog, and if I throw it he chases it like a dog...lol. also runs to the door when the doorbell rings.