My dog is loosing hair again?

Last year in the same spot, my female American Pit Bull Terrier (who is spayed) started loosing hair on her body but just in one spot. She had dry skin and we used oatmeal shampoo(my mom is a Petco Groomer) and it helped but now it's not helping and she is getting a bald patch again and it's in the same exact spot. She doesn't have a skin infection or mange. She is perfectly healthy but she just has that one bald patch and we have a hunch but I'm not sure if it's the cause. Whenever we but our dogs beds for their kennels(because they would get in fights and kill each other in we let them run around) they just sit there and chew them up instead of just laying on it so we don't bother trying to get them beds anymore because it really is too time consuming to try and train them not to chew them and my dad works 7 days a week and my mom spends her time cleaning our messy house so we don't really have the time to train them not to chew on their beds. Anyways, my dog just had dry skin now but my mom thinks that this time it is because she is just laying on newspaper and no bed. I am pretty sure this isn't the reason because they all have had to be in a kennel for 2 years because of our cats and their dad and the fighting problem. They are all separated and have the same type of kennel. None of the other [males] have this problem. What could be causing the hair loss? I have no idea what it could be! I have ruled out everything and can't think of a thing. She doesn't itch at it either! Any answers are appreciated!My dog is loosing hair again?
Sometimes dogs will lose patches of hair due to food allergies. Check your dog food, if it contains corn or wheat you should change brands. A high quality food like Blue Buffalo, Canedea or Innova will help keep your dog's coat healthy. You can also add salmon oil on top of her food to help her coat.My dog is loosing hair again?
allergic to flea bites.
It could be flea's or maybe he's allergic to something.That's all i can think of sorry!!!