Hello there. My name isXXXXX and I am sorry to hear about Mousse. So far so good that he isn't vomiting and sounds like small improvements. The best thing to do is to switch him completely over to a bland diet of boiled chicken and rice or boiled beef and rice for about 5 days. This bland diet will help settle down his tummy and on the 5th day you can mix the bland diet with his regular diet for a day then switch him back to normal diet. Also you can give pepto at a dose of 1 teaspoon per 15 lbs of body weight every 12 hours. This will help settle everything down also. You will most likely need to only use that for a couple days. Make sure he is drinking water, do not limit this, just make sure he doesn't sit down and drink a ton at one time because sometimes that will make them vomit on its own. If any vomiting does occur or if he worsens with the diarrhea then have him seen by your vet. You should see a significant improvement with the bland diet and pepto in 24 hours or so. Again make sure he isn't getting anything else besides the bland diet for the 5 days. no treats or anything. I hope this helps! Please let me know if you have any additional questions or concerns. I would be happy to help. Please do not forget to rate my response so I receive credit for my time. Thank you!