Do you go on dog walking/dog check up runs with other dogs while you are boarding/house sitting a dog? Assuming the owner is okay with you being away for short periods of time?
If not, I don't understand why the charge wouldn't be higher when you could be making more money going on multiple dog walks/dog check ins a day. However, if you could be with the dog the majority of the day and of course, all night, but throughout the day got to leave for a bit and go on those runs on top of everything - it would make sense.