Clumpy guinea pig fur

[NoraRobertsismyguiltypleasure]

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.

Is she getting a bit old? My bunny got matted fur in places he could no longer reach as he became less supple in old age, might be the same for piggies?

Thanks for the replies. It sort of feels greasy/clumpy, I guess age could be a problem. I think it's around 6, but it doesn't seem to have any difficulty moving around. I will suggest a vet visit.

Sows can get a waxy secretion when they're in season (it acts as a plug once they've mated ) so she might be 'leaking' and it's going over her fur?

And you thought Boar Glue was bad