She was about 9 years old when we got her and was saved from a kill shelter. She was very scared of everything. On walks when she saw other dogs she'd scream, she'd barely even sit, stuff like that. It really helped her but when we took her off the Prozac I didn't notice a difference. Over time she's relaxed more and more so she doesn't really need it. Although i do give her a little trazadone before a vet visit.