While it is common knowledge that most cats do not want any contact with water, hydrotherapy can be used on them to increase their mobility. Hydrotherapy on cats usually entails the cat walking on a treadmill that is submerged a few inches underwater. This allows the cat to begin walking on an injured leg or hip more easily. There is some debate about whether hydrotherapy causes too much stress for cats. If your cat is extremely resistant to getting wet, then they may have a hard time adjusting to this type of therapy.