Abby used to that when we first got her. The vet thought it was a severe flea allergy and gave us allergy meds for her. That helped for a bit. The first time we went away for a long weekend , she had severe separation anxiety despite people coming into take care of her. She is a VERY nervous girl. She ripped out some huge clumps. I did try different foods also and noticed that she definitely pulls out more fur on certain foods. We will have had her for a year in January, and I am happy to report fur ripping is now at a minimum. We have found a food that works for her, and she has gotten much more comfortable with us and her surroundings.