By Dr Duncan Houston
Chewing cardboard is normal for many small pets. Taking longer to eat, dropping food or refusing hay is a different problem and may signal pain.
The key is to support healthy chewing without assuming that every rodent needs the same diet or that a wooden block can fix overgrown teeth.
Quick Answer
Give small pets safe opportunities to gnaw, forage and explore, matched to their species. Rabbits, guinea pigs and chinchillas need a fibre-rich diet with appropriate hay, while rats and hamsters need their own balanced foods. Drooling, weight loss, reduced eating or altered chewing needs a veterinary examination; never clip teeth at home.
Why does species matter?
Rabbits, guinea pigs and chinchillas have continuously growing front and cheek teeth. Eating fibrous food supports normal wear, especially through sustained grinding. Rats, mice, hamsters and gerbils have continuously growing incisors, but their cheek teeth are different. Treating every small mammal as a miniature rabbit can create feeding problems.
For hay-eating species, chew toys supplement a suitable diet; they do not replace it. PDSA describes how rabbit dental disease can cause pain and difficulty eating. Tooth alignment, injury and other factors can still cause disease despite careful care.
What chewing materials are suitable?
Choose plain cardboard without staples, tape or heavy coatings, or purpose-made untreated wood chews with the plant species identified as safe for your animal. Do not collect unknown branches, treated timber or pesticide-exposed plants. Inspect toys for sharp edges and openings that can trap a head or limb.
Provide fresh grass hay as the dietary foundation for rabbits, guinea pigs and chinchillas according to their individual needs. Keep it dry and replace contaminated hay. For rats and hamsters, chewing opportunities accompany a complete species-appropriate diet.
Normal chewing or a health problem?
| What you see | Interpretation | Action |
|---|---|---|
| Chewing safe items, normal appetite and droppings | Expected exploration | Provide variety and supervise new items. |
| Repeated bar biting or frantic escape attempts | Possible frustration, fear or unsuitable housing | Review space, routine and enrichment; seek advice if persistent. |
| Drooling, wet chin, food dropping or weight loss | Possible dental pain | Arrange a prompt veterinary examination. |
| Rabbit stops eating or passing droppings | Potential serious illness | Contact a rabbit-experienced vet immediately. |
What else can cause unusual chewing?
Dental disease is not the only explanation. A new enclosure, social tension, boredom or an inaccessible food source can change behaviour. Conversely, an animal still accepting soft treats may have painful teeth. A vet may need to examine the mouth under sedation and use imaging to assess areas hidden from an ordinary look at the incisors.
Merck's rodent overview highlights dental disease among common clinical problems and explains why subtle changes in prey animals deserve attention.
What should you do next?
- Check normal food intake, droppings and body weight before labelling chewing as mischief.
- Offer several safe materials and remove anything being swallowed in substantial pieces.
- Protect electrical cables by preventing access, not just adding an easily chewed cover.
- Rotate a few items while keeping familiar shelters available.
- Book a vet visit for abnormal eating. Photograph the food and enclosure setup to help review the cause.
When is this an emergency?
Seek urgent care for inability to eat, severe weakness, breathing difficulty, significant mouth bleeding or a suspected electrical-cord injury. A rabbit with appetite or dropping loss should not wait overnight. Do not syringe-feed a severely unwell animal without veterinary instructions.
Common mistakes
- Clipping or filing teeth at home.
- Assuming hard treats or mineral blocks prevent all dental disease.
- Removing hay because the animal prefers pellets.
- Allowing access to paint, foam, fabric threads or electrical cables.
How can you reduce problems?
Combine appropriate food with roomy housing, safe exercise, foraging and compatible companionship for social species. Record regular weights and note changes in preferred foods. Routine veterinary checks can identify concerns before complete appetite loss.
Frequently asked questions
Are wooden chews enough to keep rabbit teeth healthy?
No. A suitable fibre-rich diet and dental assessment when signs develop remain essential.
Can I tell teeth are healthy by looking at the front ones?
No. Cheek teeth and tooth roots may have disease that you cannot see.
Is cardboard safe?
Plain, clean cardboard can be useful when the animal shreds it rather than eating large amounts. Remove staples and tape.
Does bar biting always mean boredom?
No. Review stress, housing, social interactions and health as well as enrichment.
Healthy chewing should accompany comfortable eating. When either changes, investigate the cause instead of simply buying a harder chew.
For clear guidance on everyday animal care, visit ASK A VET™. An animal struggling to eat needs a hands-on veterinary assessment.
The ASK A VET™ Tracker logs live location and activity trends, so a change in routine never goes unnoticed.
- Dental Health
- Enrichment
- Guinea Pigs
- Rabbits
- Rodents
- Small Pets
Every ASK A VET article is written and reviewed by qualified veterinarians.
