I was wondering if anyone can tell me why a guinea pigs fur would suddenly go all clumpy. I look after a friends pigs sometimes and one of them has suddenly developed this really clumpy fur over the back half of her back. She is healthy and doesn't seem to have anything else up with her.
It really depends what type of fur. Smooth or fuzzy and by clumpy do you mean sticky? Try bathing it in a bowl of warm water using baby shampoo. I used to have to do that with a long haired pig I used to have. If in doubt check with the owner if they are happy for you to take it to a vet.It could be a skin condition.