Within the TrustedHousesitters community, we have a minimum of one-night sit so we're afraid to say sitters aren't able to offer day care.
The reason behind this is that there is a mutual exchange between both sitters and pet parents. Sitters are sitting for free in exchange for free accommodation and the chance to spend time with some wonderful pets, and pet parents can go away with peace of mind knowing that their pets and home are being looked after.