Problem skin losing fur

I have a 9 week old kelpie x when we got her her skin was a little dry and flacky, we put this down to the fact that she had large amount of fleas as she wasn't very well looked after and was going to be put down. We rid her of her flea problem with puppy shampoo and a puppy flea coller and her skin looked as though it was getting better. We have now noticed that her skin has suddenly become worse and it looks as though she is losing her fur in some patches. Some areas are fine wheres others arn't. She doesn't scratch very much and doesn't seem to chew her skin. I have since removed the flea coller as i know this can sometimes cause skin irritation but my question is could there be another cause, what can i use to help her skin and what could be causing her to lose her fur..Thanks

[peekawho]

You need to take the puppy to a veterinarian about this, since its a continuing problem.  She could have mites or mange, and you can't treat this on your own.  She should be going anyway for her shots, so get some expert help with this.  

[lyndsea]

She goes in next week for her shots, the other thing that makes it strange is that when we got her (couple of weeks ago) she had very little fur on her under belly and under her arms now its grown and those areas arnt dry or anything and the fur isn't thinning its getting thicker.

[Queen E]

Whatever other treatment you try, also consider the dog food you are feeding.  Allergy to corn is commonly demonstrated by "mange-like" symptoms of hair loss, tissue swelling (especially around the toes), open sores, weeping skin.

Use a food without corn.  Corn passes through the system almost unchanged.  It is a cheap filler dog food companies use to save money and it causes digestive and skin problems.