This cat is tearing herself up her neck is shedded by her nails we have goten rid of 2 cats thinking it was them I have treated for fleas by our pest control and no visual signs of fleas or ticks the 2 other cats didn't have them and the 4 dogs don't have any signs of it like mange(sp) but she isn't showing any other signs she is still friendly with us all and 2 dogs the other 2 dogs she hates but that is normal for her any way any help is appreciated thanks for looking

Cats can get seasonal allergic rashes. Most frequently they appear at the neck or at the base of the tail. The symptoms can be eased by getting an antihistamine shot at the vet.

Yes it sounds like a job for the vet. She could have ear mites perhaps.

I'm guessing you're using a very bad chemical in your carpets or your lawn. Take her to the vet.

... what did you mean when you said you got rid of two cats because they were scratching themselves?