There are food dishes for dogs specifically made to keep out crawling insects ( for people who feed their pets outside) that have a bowl-within-a-bowl kind of design. The idea is you fill up the "outer ring" of the bowl with water, then the food is in an inner circle in the bowl, so that the food is surrounded by a type of moat, for lack of a better description. The ants can climb up the side but can't get past the moat to the food. You can get these at most any pet store, I think. I have seen them around quite a few times.
Keep Ants out of your dog's food bowl
Place each of your dog’s dishes — the food dish and the water dish — in a separate shallow pan of water. That way you will have moats of water around each of them. That should keep the ants from getting into the dog’s food and water.
Ants! In My Dog's Food! - Straight Dope Message Board
I need to find a way to put his food bowl on the floor without the ants getting it. I tried sprinkling pepper/garlic mix around the bowl, but that didn’t stop them. My dog is used to having his bowl out all day and eats at different times.
How can I keep ants out of my dog's food bowl? | FamilyPet
Ants are no fun. They seem to invade every crevice in the inside and outside of our homes, and they are really hard to get rid of. I have had a bad time with them in my garden this year too. The other day I found them in our dog's food dish. It was swarming with ants!I cleaned out the dish and replaced the food and water and soon the ants were back. One evening my husband was watching television and he saw a home remedy for deterring ants. Chalk! He said to draw a circle of chalk around the perimeter of the dog dish.I wasn't expecting to see all those ants in our dog's food dish. The dog's dish was on our patio, next to the house. I could see that the ants were coming from under our home (thank goodness we haven't found any IN our home).I'm in a quandry. The dog has to have his food and water, but I don't know how to get rid of these ants. I don't want to move the bowls into another room for fear that the ants will just follow.