The use of water for medical purposes has a long tradition in humans. In contrast, hydrotherapy for dogs is relatively new but is becoming increasingly popular. The healing properties of water also benefit our four-legged friends. Therapeutic swimming, in particular, provides a gentle, pain-free full-body workout that allows for targeted strengthening and building of muscles. Additionally, it improves endurance and cardiovascular health, and the power of water can often stimulate nerves in cases of paralysis or neurological deficits. All of this comes with very few contraindications. The effectiveness of hydrotherapy lies in the physical properties of water. The first specialized book on hydrotherapy for dogs describes these properties in detail, as well as their targeted effects.