I noticed a few weeks ago that the hair on my guinea pigs' back was thinning. I assumed it was because he's always crawling under his house as opposed to using the door
Then I noticed that the other GP was going the same way (but he does the 'under the house' thing too.
Anyway yesterday I noticed that the thinning hair on one GP had gone almost totally bald! you can feel his little back bone!
He seems happ enough though, still eating (nothing keeps him from his food!) and playing etc.
Why is he going bald??