Help with degus tail
So, I have 2 degus that are 4 months old. One of them lost hair on it's tail, 2 days ago it was normal and i don't know what is going on so any help would be appreciated.
INFO:
-their cage is 90*50*120 with 3 levels
-they have a wheel that is 30cm its solid wood with no gaps and cork lining on the inside
-they have ropes and branches
-I know they need more enrichment but that is a work in progress right now
-they mostly eat meadow hay rarely they get pellets
-they are let out for playtime daily and during that they each get 2 sunflower seed each
-they get half a peanut rarely
-they get sand bath 2x a week for around 30m
