My cat is currently 3 years old. When she was 2 months old, I thought about trying to shampoo her, so I bought this. The vet told me, "She's still small, so please don't shampoo her," so I stopped, and she never got shampooed even as an adult... This is completely unused. However, it has been stored for a long time. There's no expiration date, and since it's shampoo, I thought it would be okay, so I decided to list it. Perhaps someone who is used to shampooing their pets would be interested? Please be sure to read my profile. Thank you very much.