Well, I don't have a dog, but when I am shopping at the local pet stores, my daughter always shows me a product in the dog section that is for doggy gas, because there's a really adorable boxer dog on the package, looking embarrassed . It's in a pink colored bottle, I think, and might be made by Four Paws. You might want to check some of the pet store websites, like Petco, etc., and just put "gas" in as a search word.

Make sure you check with your vet before using it, of course, since your baby is ill .