Miracle Vet All-Natural Weight Gainer. This concentrated energy gel is a protein & nutrient powerhouse that helps any dog gain weight safely & effectively! HIGH IN CALORIES: 2,400 calories per 16 oz. ALL-NATURAL: Helps your dog gain weight safely & effectively EASY TO USE: Can be fed with a syringe, added to water, or added to food WORKS FAST: Adds healthy weight to your dog faster FOR DOGS & CATS: suitable for both dogs and cats ages 4 weeks and older. ALL-NATURAL: No artificial colors, flavors, or preservatives.