He is a dumbo, and is a little short of a year and a half. I noticed that his skin is a little yellow and flaky, and I was wondering if it could be buck grease? I don't know much about it, but I've seen a couple of people recommend giving rats olive oil to help improve their skin and fur.
Do you know if this could be part of why his fur is falling out? If so, do you know if olive oil will help?
I added a more flattering picture of him and his brothers so you can see what he looks like when he's not so disheveled (he's the one on the far left)
Thank you for your help, and I'm sorry if I'm bombarding you with questions.