A veterinary composition for preventing feline urological syndrome in cats, comprising from 25 to 75% by weight of green plant powder, from 15 to 45% of a urine acidifying agent, from 9.5 to 28.5% by weight of a soft diuretic agent and from 0.5 to 1.5% of a calcium chelating agent, based on the total weight of the composition. A method for administering such a veterinary composition to a cat is also disclosed comprising using a veterinary litter comprising particles of wood or of wood derivatives covered with 0.1 to 4% by weight of the above veterinary composition based on the total weight of the particles. An animal using this litter composed of particles covered with an external layer of medicine impregnates its paws, part of its fur and its muzzle with medicine without noticing it and then unconsciously ingests the medicine when it cleans itself by licking its paws and fur.