In some cases, the effort an assignment requires goes beyond what the service usually entails - think of special needs pets, a long commute to a home visit or home visits to a household with a large number of pets. In that case, you may ask to negotiate a slightly higher rate.
You can change your rate to the custom rate you negotiated with the pet parent, have them book, and then change it back to normal. We will add a more convenient custom rate feature in the future.