Kirbys Mom, Read all about how to take care of Chihuahuas. It is very helpfull.I read my books all the time. Chihuahuas are very delicate toy dogs. They have trachea problems. But they are minor . make sure when you hear you chi trying to catch his breath, it is only the trachea semi closing up because they are excited. Tell your chi to calm down. and they should catch their breath,Chica does it every time I come home , she gets excited to see me.Its common in toy breeds. I learned that from my books, and talking to other chi owners.