Although the benefits of resveratrol for dogs and cats are still being tested, we may assume that the same benefits we as pet owners receive from this powerful, natural antioxidant can be seen in our animals as well. Perhaps the most exciting benefit of resveratrol for animals is in its potential to prevent and slow the rate of cancer growth. Due to resveratrol's anti-inflammatory and anti-cancer properties, the National Cancer Institute states that lab tests have shown to actually reduce tumor growth by affecting one or more stages of cancer development and that it seems to restrain cancer cell growth.