Beyond Cats and Dogs: Feeding Rabbits, Guinea Pigs, and Other Small Pets
Small pets aren’t small dogs. Rabbits and guinea pigs are grazing herbivores whose health lives or dies by their hay, and getting their diet right prevents most of their problems.
Pawchika is mostly about cats and dogs, but plenty of homes share space with a rabbit, guinea pig, or other small mammal, and these pets are too often fed as if they were tiny dogs. They are not. Rabbits and guinea pigs are grazing herbivores with specialised digestive systems built to process a steady stream of fibrous plants. Get that right and most of their common illnesses simply do not happen; get it wrong and the bowl becomes the source of their problems.
Built to Graze All Day
A rabbit or guinea pig in the wild eats grass more or less constantly, and its body depends on that. Two things hinge on it. First, their teeth grow continuously, and the chewing of tough, fibrous hay is what wears them down, without enough chewing, teeth overgrow and cause painful dental disease. Second, their gut must keep moving at all times; a digestive system that slows or stops (a condition called gut stasis) is a genuine emergency in a rabbit. Constant fibre is what keeps both the teeth and the gut healthy.
Hay First, Always
The single most important rule is that grass hay should make up the bulk of the diet and be available at all times, not as a bedding afterthought but as the main food. On top of that go a daily handful of suitable fresh leafy greens and only a small, measured portion of plain pellets. The common mistake is reversing this, making pellets or muesli-style mixes the main meal, which leads to obesity, dental disease, and dangerous gut problems. Pellets are a supplement to hay, not the other way around.
For rabbits and guinea pigs, unlimited hay is the foundation; pellets are a small extra.
The Guinea Pig’s Special Need: Vitamin C
Guinea pigs share a quirk with humans: they cannot make their own vitamin C and must get it from their diet every day. Without enough, they develop scurvy, with painful joints, poor healing, and illness. This is why guinea pigs need a daily, reliable source of vitamin C, through suitable fresh greens and a guinea-pig-specific pelleted food, and sometimes supplementation. (Vitamin C also degrades in stored pellets over time, another reason fresh greens matter.) Rabbits do not have this particular requirement, a good example of why you cannot feed one species like another.
Treats, Changes, and Red Flags
Sugary, fatty treats and seed or nut mixes marketed for small pets do more harm than good, upsetting the gut and adding empty calories, keep them rare or skip them. Make any diet change gradual, since these animals’ gut bacteria are sensitive. And learn the warning signs that need urgent veterinary care: a rabbit or guinea pig that stops eating or passing droppings is in real danger, because their guts must never go quiet for long. Other species, from hamsters to ferrets, have their own very different needs, so always check the specifics for your particular pet.
The Pawchika Checklist
Feeding rabbits and guinea pigs:
- Make grass hay the bulk of the diet, available at all times, it protects teeth and gut alike.
- Add a daily handful of suitable fresh leafy greens.
- Offer only a small, measured portion of plain pellets, not a full bowl.
- For guinea pigs, ensure a daily source of vitamin C, they can’t make their own.
Avoid and watch for:
- Skip sugary, fatty treats and seed/nut mixes, and change diets gradually.
- Treat a small pet that stops eating or passing droppings as an emergency.
- Check the specific needs of your species, hamsters and ferrets are different again.
The Pawchika Bottom Line
Small herbivores live and die by their hay. Make grass hay the foundation, add greens and just a little pellet, and give guinea pigs their essential daily vitamin C, and you prevent the dental and digestive diseases that fill exotic-vet waiting rooms. Above all, remember the golden rule that sets them apart from cats and dogs: their gut must never stop, so a small pet that won’t eat needs help fast.
Related reading from the Pawchika library: Vitamin Guide, 10 Essential Foods, Digestion & Absorption.