[Rusty's Momma]

This isnt really a grooming question but I guess I will ask anyway... I may need this in the health/diet section. Anyway...
I noticed yesterday that Sophie is loosing her hair at the tip of her ears. Here is a pic to show. She used to have hair all the way up and falling over like the rest of it. Any ideas of what might be causing this? I havent changed her diet or bathing products Her skin actually looks dry & flaky