During the BlogPaws pet bloggers conference, I met the ferret half of the Snotface & Twiggy team, and of course asked about travel carriers for ferrets. Snotface’s owner told me that normal pet carriers don’t work for him — he’s a digger, and he’s figured zippers out — so she’s  modified a lidded plastic hanging file holder, like the kind you’d get at Office Depot, to serve as his carrier. She’s drilled several holes in its sides — big enough for his head to poke out, but not so big that his body can follow — and its sturdy bottom…