Revival Animal Health Doc Roy's FORTI CAL - 4.25 oz Flavored Energy Gel for Dogs and Cats 3 pk Doc Roy's FORTI CAL gel will help get your puppies and kittens off to a great, healthy start! ENERGY - Doc Roy's FORTI CAL is the premier high calorie and energy supplement used to support healthy weight gain in dogs and cats. SUPPLEMENT - Doc Roy's FORTI CAL supplies extra calories for weak or sick animals when they need it most. SUPPORT - Doc Roy's FORTI CAL gives extra energy to performance, hunting, and working animals including cats and dogs. GEL- Doc Roy's FORTI CAL is a tasty roast beef and liver flavored gel that your animals will lick right up!