Hello. I have a 3 year old 10 pound male chihuahua and a 9 month old 4 pound female chihuahua. I am currently feeding them eukanuba dog food but was wondering what would be the best cheap food I can get them at the local petstore? Is lamb and rice better than chicken and beef ? My 3 year old male chihuahua has some weird spot on his head and sometimes he gets black bumbs and his hair has fallen off on that part of his head. I took him to 2 different vets since neither of them could find a cause for that. They just said the only thing they can think of is food allergies. So what brand of dog dry food would be best for my small dogs? Thanks alot for your advice.