Hi, Lisa. I am also a pet care provider like Deb, not an employee of Rover. While I offer a deeply discounted rate for an additional dog, my rates are not solely based on the 30 minutes spent at the client's home. We have to take into consideration travel time, gas, mileage, and the responsibility of caring for your family members. Often I find that when owners have two (or more) dogs, they may eat different foods, need to eat separately, may have separate walk needs, one or both may need medication, etc. It is also important to think of potential liabilities by caring for more than one dog, as there is now a higher chance of something going wrong, such as a dog bite or one of the animals falling ill or accidentally getting injured. I understand that these are sort of the negative side of pet sitting and certainly do not reflect all of the overwhelming positives, but they are things to think of. Even if for no other reason than bearing the responsibility of caring for two dogs versus one, I think that each sitter has a claim to requiring an additional dog rate, since the rate is really not based on time spent at the home. However, as Deb suggested, you can always connect with sitters and ask them what their policy would be based on your needs. I just hoped to shed some light on why they may require that extra dog rate!