Fixing selective feeding in guinea pigs

Muesli mixes and selective feeding go hand in hand — guinea pigs are very good at picking out the sugary bits and leaving the nutritious ones, and at 14 months your Himalayans are old enough that this habit can start causing real nutritional imbalances. Worth sorting sooner rather than later. Before I point you to the right replacement, quick question: are they otherwise healthy — good coat, normal weight, eating their hay well? And are you looking to switch their main dry food only, or do you want to overhaul the whole diet?

Good — if hay intake is solid that's the most important thing. Pickiness with the muesli is completely expected; once they learn which bits taste best they'll hold out for those. The fix is straightforward: move them onto a uniform pellet where every mouthful is identical, so there's nothing to cherry-pick. What muesli are they on at the moment, and roughly how much dry food do you put down each day?

That's a generous amount of muesli — dropping to a tablespoon of pellets per pig per day is actually the right portion, which surprises most owners. The product I'd switch to is Science Selective Guinea Pig Food by Supreme Petfoods. It's a uniform extruded pellet with a good vitamin C level — important because guinea pigs can't synthesise their own — and it's high in fibre to complement their hay. There's genuinely no selective feeding possible because every piece is the same. It's widely available on Amazon UK in a 1.5 kg or 3 kg bag and is very well tolerated even by picky eaters. Transition slowly over about ten days, mixing it with the remaining muesli and reducing the muesli portion each day — that avoids digestive upset and eases them off the habit.

No — and this is something the muesli marketing quietly obscures. Guinea pigs are grazing animals; unlimited quality hay should make up roughly 80% of their diet. The dry food is really just a supplement to top up vitamins and minerals, not the main course. A tablespoon of Science Selective per pig daily alongside ad-lib hay and fresh leafy greens covers everything they need. If anything, reducing the dry food and relying more on hay is better for their teeth and gut motility. You won't be starving them — you'll actually be feeding them more correctly than before.

Perfect. Stick to the gradual ten-day swap and you should find they take to it well — most guinea pigs accept it without fuss once the muesli is fully gone and there's nothing more interesting to hold out for. If you notice any loose droppings during the transition just slow it down a little. Good luck with both of them.