Depending on the specific design of the harness and the nature of your pup’s ailment, a lifting harness may make it more difficult to use the bathroom. This is particularly true of males trying to pee. Generally, females don’t have trouble peeing or pooping with a lifting harness on. If you are worried about your furry friend being able to pee or poop easily in their harness, there are some models specifically designed with this in mind.