Tatum's breeder gave us a tube of it when we picked Tatum up. We used it at times when she wouldn't eat well and especially after she would have a real hard playing spell - like running around in the yard for a long time. If we went somewhere like my daughter's softball games, I would take it in case she got lethargic from the heat or from not eating or drinking from the excitement. Definitely a good idea to have some on hand just in case. We called it Tatum's "go-go juice"! And she knew exactly what that was when we said it!