What should I look for in a healthy ferret?

What should I look for in a healthy ferret?

I'm going to buy a couple of four month old kits for the first time. What signs should I be looking for when I check them over prior to paying for them. For a start, should I visit the owner to see how and where they're kept?

When do you feed your ferrets?

How often, and at what times of the day do you feed your ferrets? One of my ferrets occasionally refuses to come out of a burrow and sometimes it can be underground for hours!