I don't care about mess or untidiness at all in my CM's home as long as the important things are clean (e.g. toilets, tables, highchair etc). I expect to see a wheen of toys all over the place and plates or some mess where snacks have taken place or after lunch.
I want my son to have a nice time playing when he's at the CM - its a home from home environment I'm looking for (and my home is a tip!), if I wasn't I'd have sent him to nursery.
Families create mess, as long as it's mess and not dirt, I'm happy, but I loathe housework myself (and rarely do it) so maybe my standards are pretty low :-)
We have 2 cats, one fluffy, one shorthaired and the fluffy one molts all the time - total nightmare (they were rescue cats, but id' never take another long haired cat again) I literally need to hoover 2-3 times a day to keep the fluff off the carpets.
I would say that when I was choosing a CM, having pets was on my 'want' list as I wanted my child to have daily exposure to pets (we didn't have the cats then) so I would have expected some pet-related mess. As it turned out my CM doesn't have pets (my 'want' list disappeared when I just met my CM, decided I liked her and how she was with her mindees and that's enough for me :-)
Maybe with you being run down just now having a cleaner for a couple of days would help until you're back on top, but if no-one has complained you're probably doing a fab job and are just being over-critical of yourself.