It is hard to find a good cavy vet but if you take time looking and asking questions you'll find one. Your pig does sound like he has mites. He'll need three shots of Ivermectin each 7-10 days apart. Mites are very painful to pigs so you'll want to treat him ASAP.

If you can't find a competent vet you may want to print off dosing instructions from GuineaLynx and bring them in to the doctor. Mites are very easy to treat as long as you get the 3 treatments.

If you are interested in treating your pig yourself there are guides that'll help you on GuineaLynx. If you don't feel comfortable treating your own pig just find a vet. Good luck and sorry to here about Pete.

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