My cat that I had recently lost had hair thining down her back. I wasn't exactly sure what the exact cause of it. But, I had her on the same type of food since she was a baby. I did try switching her food at the time and only noticed a slight change. I noticed that she would like to roll in the dirt also. So, I am sure that it could be from multiple things. Does anyone know what it would be from or least expirance this? Any advice on hair loss would be great just in case I come across this with a future cat.