Hello, I'm not if I posted this on the right thread by one of my GPs is having slight fur loss on the back of her neck. I have two GP Cola and Pepsi, Pepsi has immaculate fur and the right size and weight (1050g), but Cola has always been lighter (not underweight but significantly lighter than Pepsi: 950g) and Cola has patchy fur in between her ears. I am a bit confused as it doesn't look like it has been pulled out, just fell out, but the rest of her fur is fine and Pepsi's fur is lovely. What shall I do?