Are you concerned about what your pet sitter is doing while you are not at home? Just like there are nanny cams for children being watched in the home, there are also camera and security systems you can use to monitor what is happening in your home with the pet sitting service. They provide a great resource when you have to know.
Are you using a pet sitting service that you take your pet to while you are at work? Are you concerned about what they are doing with your pet when you are not there? Make it a point to come and pick up the pet at different times of the day. You may want to just stop by at your lunch hour to check in. This means that the sitter needs to allow you access to your pet at any time. Surprise visits are sure to give you an inside look at what is happening when you are not there.