What treatments do they use to treat guineas for ringworm? How long does it take? I bought two guineas Aug 2 and ten days later Bob started missing more hair off his cheek. I took him back the following week for a follow up and noticed Maverick had the similar problem. The vet thought mites even though a skin scraping showed nothing. Recently two pigs who were also caged with them at the store were returned and they had ringworm. So now they're treating them for ringworm. They offered us two new pigs and I want to try to get them better before I even think about accepting a new pig. I've already cleaned and disinfected the cage really really well. I'll do a second scrub down of the cage just prior to bringing the pigs home.