When dogs consume cantaloupe, they're taking in vitamins to promote good eyesight and eating a food with major antioxidant powers. Cantaloupes are an excellent source of vitamin A because they contain lots of beta carotene. In humans, cantaloupe consumption has been linked to a reduced rate of cataract growth [source: World's Healthiest Foods]. Similarly, the vitamin A content of cantaloupe helps to promote good vision in dogs [source: Donamor]. The beta carotene found in cantaloupes also reduces the risk of cancer and prevents oxygen damage to cells. In addition, cantaloupe contains vitamins B-6 and C, as well as fiber, folate, niacin and potassium. Vitamin C acts as an antioxidant that can help to prevent cancer.
Cantaloupe is a particularly good fruit to feed to dogs because it is usually not allergenic, so most dogs will be able to consume it without experiencing an allergic reaction. Harmful goitogens, naturally occurring substances that reduce thyroid function, and pesticides are usually not found in measurable amounts in cantaloupes.