Safe DIY guinea pig enrichment ideas

Love that you're already making your own tunnels — that instinct to keep things interesting for your piggies is exactly right. Before I say more, worth knowing upfront: guinea pigs are social animals and really should be kept in pairs or groups, and the single biggest thing most owners underestimate is space — the majority of cages sold for guinea pigs are genuinely too small for two. So how many guinea pigs do you have, how old are they, and are you mostly looking for enrichment ideas, or do housing and food come into it too?

Great setup — Merinos are curious, active piggies and a year old is prime enrichment age. On the DIY side: plain cardboard is brilliant and completely safe as long as it's unbleached and has no tape, staples, or printed ink on the inside. Brown paper bags, toilet roll tubes stuffed with hay, and small paper bags of herbs all work well. For natural materials, untreated wood like apple or willow branches are safe to chew; avoid anything painted, varnished, or from stone-fruit trees like cherry or plum. Fleece strips tied loosely into a hideout are fine too — just check nothing can tighten around a neck. What I'd actually suggest buying to go alongside all of that is a bag of dried herbs and flowers from Small Pet Select or a similar supplier — but the single most useful affordable product is the Rosewood Small Animal Activity Tunnel. Can I tell you why that one in particular?

Cardboard is great but it gets soggy, collapses, and needs replacing constantly — which adds up in time even if not money. The Rosewood Activity Tunnel is made from natural seagrass and paper rope, so it's fully safe to chew, holds its shape for months, and gives your Merinos something with actual texture to investigate and gnaw. Merinos in particular tend to be heavy chewers because of their dense coat — they seem to compensate by being very oral — so something with structural integrity matters. It's around £5–7 on Amazon UK and genuinely lasts. You can stuff it with hay or herbs to make it a foraging tunnel, which is where the real enrichment value comes from. Your cardboard tunnels and this together give them variety in texture and longevity, which is the combination that keeps guinea pigs consistently engaged rather than habituated to one thing.

Yes — avoid PVC pipe. It's not chew-safe, can off-gas, and the smooth interior doesn't give guinea pigs anything to grip, which makes them anxious rather than curious. Also avoid: newspaper (the ink), fleece with loose threads that could wrap around legs, plastic bottles with sharp edges, and anything with adhesive. Cotton wool or similar fibrous stuffing is a hazard — it can cause gut impaction if ingested. Stick to paper, plain cardboard, untreated natural wood, hay, and food-safe herbs. Everything else, ask yourself: if they eat the whole thing, is that fine? If the answer's no, leave it out.

That's a really solid plan. Rotate things around every few days even if nothing is worn out — novelty of position matters as much as novelty of object for guinea pigs. And stuffing any tunnel with a loose handful of meadow hay with a few dried herbs hidden inside turns a passive object into an active foraging session. Your two Merinos will sort it out quickly.