Senior guinea pig pellet advice for older cavies

A pair of 4.5-year-old Peruvians with a few grey hairs coming through — they're properly into their senior years now, and it's great that you're thinking carefully about their diet at this stage. Guinea pigs are social animals and should always be kept in pairs or groups, so you're already doing that right. Space matters hugely too — most cages sold for guinea pigs are far too small for two, so worth double-checking theirs. But on to your question: before I point you to a specific pellet, can you tell me a little more? Are both of them still eating well and maintaining weight, or has one started to slow down? And are they on a plain pellet right now, or a muesli-style mix?

Good news — Excel is a decent base, so you're not starting from a bad place. The main shifts worth making for senior guinea pigs are lower calcium (kidney and bladder issues become more common with age), slightly higher vitamin C since older cavies absorb it less efficiently, and ideally some joint-supportive nutrients like glucosamine. What I'd recommend switching to is Supreme Science Selective Senior Guinea Pig Food. It's specifically formulated for guinea pigs aged four and over, with reduced calcium, boosted vitamin C, and added glucosamine. It's one of the only pellets on the UK market genuinely designed for this life stage rather than just marketed at it. One thing: transition slowly over about ten days by mixing it with their current Excel — older digestive systems don't love sudden changes.

Pellets are the right place to start, but there are a couple of other things worth keeping an eye on. First, fresh leafy greens stay important — romaine, rocket, and fresh herbs like parsley keep vitamin C topped up between meals. Limit high-calcium veg like kale and spinach now they're older. Second, weigh both of them weekly if you can — a small kitchen scale works fine, and catching gradual weight loss early is genuinely the most useful thing you can do for a senior guinea pig. Dental issues and early kidney disease both show up as slow weight loss before anything else is obviously wrong. Other than that, sounds like they're in good hands.

For adult Peruvians, healthy weight typically sits between 900g and 1,200g, though individuals vary. What you're really tracking isn't hitting a specific number — it's consistency. If either drops more than 50–60g over a couple of weeks without an obvious reason like a dietary change, that's worth a vet visit. Keeping a simple note on your phone each Sunday is enough. You don't need anything fancy.

You're very welcome. They sound like well-looked-after pigs — the fact that you're being this proactive at 4.5 years is exactly the right approach. Good luck with the switch, and enjoy those fluffy Peruvian manes.