Hi!
Please have your piggy seen by a vet promptly, ideally today - saliva is very worrying; it means that could be an issue with swallowing (overgrown back teeth, fungal oral thrush or a blockage of some sort somewhere in the digestive tract).
Skin parasites like hay mites and potentially a fungal skin infection could be secondary to a weakened immune system.
Please accept that we cannot (nor are we allowed or qualified to) diagnose without a hands-on examination. We can only tell you whether and how soon to see a vet going by your report based on our experience.
Emergency, Crisis and Bridging Care until a Vet Appointment
New guinea pigs: Sexing, vet checks&customer rights, URI, ringworm and parasites
Unfortunately, anybody can call themselves a breeder or a rescue without licensing or strict welfare supervision in the English speaking world. For sale breeders are generally not interested in investing lots of money on animals they see as a cheap source of income. We have got a rescue locator on the top bar for those good welfare standard rescues we can guarantee that you are in safe hands but as we are a strictly non-breeding forum, we don't cover breeders. Beware of the ones that won't let you see their premises and even the ones with clean cages - you can still end up with parasites or an unplanned pregnancy as we see repeatedly from members who swear they have a 'good breeder' just around the corner...
The guide links above are part of our comprehensive and very useful New Owner guide collection which specifically addresses all the most often asked questions, concerns and pitfalls that new owners can come across. You may want to bookmark it and use it as resource. The guides format allows us to update and extend our information at need.
... best to take them to the vets for a thorough check up.
