What could be causing my dog's sudden hair loss?

I have a 5 year old australian border collie. When I was brushing her I noticed she has 3 bald spots that aren't really all that bad or noticable, but they still concern me. The largest is on her back about the diameter of a can of soda and already has spiky new hair growing back in. The second is on the outside of her leg and she has a completely bald patch the size of a penny that is slightly red. the last and worst is on the inside of her leg and is not completely bald, but is red and scaby and about half the size of a dollar bill. She has had dry skin problems in the past, but none since we started feeding her an all-natural organic dog food. She is not fixed, but has never gotton pregnant. She is lactating though, as she usually does for a while after being in heat. My mother says it's just her winter coat comming in, but she always thinks eveything is fine when it's not, so I dont trust her with my pets. What could be causing this?

What could be causing my dog's sudden hair loss?
I think that you feeding her organtic dog food is really helping her. I wouldn't worry about the bald spots anymore since they are slowly going away. If you are still concerned you should take her to a vet, but I'm pretty sure that nothing is wrong with her, if anything she could have been allergic to her old dog food.
Reply:How long ago did you put your dog on the organic dog food??
Reply:Allergies or a serious illness
Reply:When dogs are lactating they loose hair. It's very common for bitches who have just given birth or feeding a litter to get bald spots.


Is there a reason why you haven't spayed her? If you spayed her she wouldnt have to deal with all the stress on her body every time she goes into heat or has a false pregnancy.
Reply:When you changed her food, did you do it overnight or little by little?





Sudden change in feed can cause problems. Also, fur mites can be the problem .. it is flea and tick season, and mites eat at the skin to where you will see patches come out.





Check her over with a fine tooth comb (literally) and also consider there may be something in the new feed that she cant handle.





GL
Reply:Why aren't you asking this question of a VET?! There could be any number of reasons: allergies, dry skin, itching, skin problem, hormonal imbalance, thyroid problem, etc. TAKE YOUR DOG TO THE VET and stop the guessing games! Start acting like a responsible pet owner.