There are many reasons why Winstrol is one of the most preferred steroids to fight illnesses and to promote physical strength and endurance. In fact, it is also effective for pets. Winstrol-V, a steroid version specifically made for pets is sometimes very helpful in helping animals recover from serious illnesses and surgery. Winstrol-V can only be acquired with a prescription and are generally recommended to increase appetite and to boost weight gain. Stanozolol contains testosterone that helps animals and humans add weight and allow them to maintain a healthy weight and increase appetite.