Hennet P, Servet E, Soulard Y, et al. «Effect of pellet food size and polyphosphates in preventing calculus accumulation in dogs.» (dogfoodinsider.com)
According to the House Rabbit Society, pet rabbits need a daily ration of high - quality pellet food with a minimum fiber content of 18 percent. (animals.mom.me)
Some loose seed mixed foods also contain a balanced pellet food as part of the mix (which is ideal). (thesprucepets.com)