I was at the vet with Snowball a few weeks ago and I asked the vet some questions such as how to clean anal sac and how often can I bathe him. And the vet told me that there's no need to actually clean inside the anus, just need to clean what's outside. And I can bathe my guinea pig once a week. This is a considered cavy savy vet. But what he said is sort of in conflict with what I've read in here. So I'm not sure who to listen to.
Before I took him to the vet I've posted a question about Snowball's dirty back, a lot of people said it should be fleas or parasites. But the vet only found possible ear mites. Can the dirt left by the ear mites gotten on his lower back area?
Also the vet said I can use sand for Snowball and he can bathe himself in it, just like the chinchillas. Is that true?