Plain, unprinted cardboard is generally fine for guinea pigs to chew, but it is a toy, not a food. Guinea pigs like to gnaw on tubes and boxes, and small nibbles of plain cardboard are not toxic. The risk comes from swallowing large amounts, or from chewing cardboard that has ink, glue, wax, or tape on it.
Is Cardboard Safe for Guinea Pigs?
Plain brown cardboard has no nutritional value. If your pet swallows large chunks, it can add bulk that does not belong in the gut. Healthy guinea pigs mostly shred and spit out cardboard, but if you notice yours is eating a lot of it, tell your vet. Constant chewing at things can also point to boredom or not enough hay.
Safe Cardboard Options
- Plain brown cardboard boxes with the tape, labels, and staples removed
- Toilet paper and paper towel tubes (empty, with no glue lines)
- Plain brown paper bags with handles removed, used as a hideout
Cardboard and Paper to Avoid
- Glossy or printed cardboard: inks and coatings are not meant to be eaten.
- Waxed or treated boxes: food boxes may be coated.
- Anything with tape, staples, or strong glue.
- Cardboard with scented chemicals or cleaning-product residue.
- Paper bags with ink, handles, or glued seams that your pet could chew off.
Cardboard Tubes as Enrichment
A tube stuffed with hay turns a toy into a foraging game. Replace it when it is soaked with urine or badly chewed. Because cardboard gets damp, do not rely on it as permanent bedding or housing.
Better Chewing Choices
Teeth wear down best on unlimited grass hay. Untreated willow or apple-wood sticks sold for small pets can also help. Read our guides to hay for guinea pigs and what not to feed guinea pigs for more on safe chewing and diet.
When to Call the Vet
- Your guinea pig eats large pieces of cardboard or paper
- Droppings shrink or stop
- Appetite drops or the belly looks swollen
Bottom Line
Plain cardboard and plain brown paper are okay for chewing and hiding, as long as they have no ink, glue, tape, or staples. Hay is still the best food and the best tooth wear.
This article is general information, not veterinary advice. If you think your guinea pig swallowed something it should not have, call a vet.
