Jack Russell puppies should be fed a commercial dry diet that includes meat, such as chicken or fish, as the primary ingredient. Avoid foods that list grains in the first five ingredients. Jack Russell puppies need around 800 to 900 calories per day until they turn 1 year old.

Foods that contain meat by-products and chemical preservatives should be avoided. Young puppies should be fed dry food soaked in water four times a day. At age 3 months, reduce the number of feedings to only three times a day and stop soaking the food. Adult Jack Russells should be fed two to three meals per day.

Food-related health concerns with Jack Russells include food allergies and keeping the teeth clean. All small dogs are prone to tooth problems, and Jack Russells are more prone to food allergies than many other dogs.