Oxbow Essentials Adult Guinea Pig Food

Pellets are the supplement, hay is the diet

The most common guinea pig feeding mistake is treating pellets as the meal and hay as the bedding. It is the wrong way round, and it causes the two conditions that most often bring guinea pigs to the vet.

Unlimited grass hay should be the great majority of what a guinea pig eats. It wears the continuously growing teeth at the rate they grow — without it, molars form sharp spurs that cut the cheek and tongue — and it keeps the gut moving, which in a hindgut fermenter is not optional.

A guinea pig that fills up on pellets eats less hay, and both problems follow.

The usual guidance is a measured portion of pellets once a day, alongside unlimited hay and a daily portion of fresh vegetables. Free-feeding pellets from a permanently full bowl is how guinea pigs get fat and how they stop eating hay.

Vitamin C: the reason this food exists

Guinea pigs, like humans and unlike almost every other pet, cannot synthesise vitamin C. They must get it from the diet every day.

Deficiency causes scurvy: lethargy, a rough staring coat, painful swollen joints, reluctance to move, poor wound healing, and eventually death. It is entirely preventable and still turns up regularly.

Two practical points that matter more than the brand:

Fresh vegetables are the other daily source. Bell pepper is unusually high in vitamin C and most guinea pigs love it.

Timothy-based, and why that matters

This is a timothy hay-based pellet rather than an alfalfa-based one, and the distinction matters for adults.

Alfalfa is much higher in calcium. Excess dietary calcium is associated with urinary sludge and bladder stones in guinea pigs, which are painful and sometimes need surgery. Alfalfa-based food is appropriate for young, growing, pregnant or nursing animals and is the wrong staple for a healthy adult.

If your adult guinea pig is on an alfalfa-based pellet, that is worth reviewing.

Avoid muesli-style mixes

Any pellet food, this one included, has one advantage over the colourful mixes with seeds, corn flakes and coloured pieces: it cannot be picked apart.

Guinea pigs offered a mix selectively eat the sweet, fatty, palatable components and leave the fibrous pellet. That is selective feeding, it produces an unbalanced diet, and it is why veterinary and welfare guidance consistently recommends a uniform pellet over a muesli mix. Every piece being identical is the feature.

The dust at the bottom of the bag

Pellet foods generate fines. It is not harmful and the animals generally will not eat it, so it is simply waste. Tipping rather than shaking, and not emptying the last dusty portion into the bowl, is all that is needed.

If a guinea pig is sneezing, has nasal or eye discharge, or is breathing noisily, that is a vet visit — respiratory infection in guinea pigs progresses quickly and is serious.

Introducing a new food

Guinea pigs are conservative eaters and a sudden change can cause them to stop eating, which in a hindgut fermenter is dangerous. Transition over one to two weeks, mixing an increasing proportion.

A guinea pig that has stopped eating, or is producing fewer or smaller droppings, needs a vet promptly rather than being waited out.

Who should look elsewhere

Young, pregnant or nursing guinea pigs need an alfalfa-based formula for that stage. A guinea pig that is losing weight, refusing hay, or has swollen joints needs a vet, not a different bag. And whatever pellet you buy, it does not replace unlimited hay and a daily source of vitamin C.