When you accept a request, you need to meet with the pet before the start of the request date. Once you meet and its all good vibes, on the day itself you have to be responsible for the following:
1) Feed the pet
2) Ensure they have water
3) Clean the cat litter box
4) Take the dog out to do their business
This needs to be done twice in one day, morning and evening. Thats all you are responsible for.