My Chihuahua is a bit over two years old. At around 1 year he just suddenly lost a patch of hair(he is blond short haired) took him to vet who said he was bitten by an insect. I always felt that was crap but the spot looked/looks healthy no itching or anything we just thought oh well. Now about a month ago I saw another spot and now theres another one both by the original spot which is about the size of a quarter. This is quite large on him since he is under 3 pds. I hate it. He is so cute and looks like he has mange or something. I will be taking him to vet this week but I have no confidence that he will be able to diagnose as skin problems in dog or even humans rarely are in my experience. He used to eat Blue Buffalo but we switched from that because it isn't sold local but I will be driving today and getting some to switch him back. I wish I could remember if this started after we switched foods but sadly can not. Any help? Thank you in advance. Tracy.