most cats are lactose intolerant. but she hasn't shown any signs of lactose intolerance like diarrhea or vomiting. small amounts can be ok if your cat doesn't generally react to it. I should have clarified that the mixture is primarily for me, she just had a few licks :3 and blueberries are completely safe for cats and dogs (although just as a treat due to high sugar content)! it's grapes that are toxic to cats and dogs, which I think are often confused with blueberries.