Is Ink Pens & Printer Cartridges Safe for Dogs?
Why it’s a problem
Writing inks and inkjet dye are deliberately low in toxicity, so a chewed pen usually produces a stained mouth and mild stomach upset rather than serious poisoning. The genuine hazards are mechanical: pen caps and barrel fragments can cut the mouth or obstruct the gut, and toner powder from laser cartridges is a lung and stomach irritant in quantity. Dogs chew pens because they roll and squeak like toys.
How to keep your pet safe
Keep pens in cups and drawers, never on couch cushions or in backpacks on the floor, and retrieve dropped ones immediately. Store spare printer cartridges in a closed drawer and bin empties in a lidded can. Pick up scattered pens before leaving the room — dogs need seconds, not hours.
Warning signs to watch for
Blue or black stained mouth and paws, drooling, mild vomiting, diarrhea; with swallowed plastic: choking, gagging, repeated vomiting, constipation, or refusal to eat (blockage signs can be delayed); with toner powder: coughing and sneezing.
When to call the vet
Call your veterinarian or a pet poison hotline (ASPCA APCC / Pet Poison Helpline) and describe what was chewed and whether pieces are missing. Most ink exposures need monitoring only, but go in promptly for repeated vomiting, choking, or a missing cap or barrel section. Bring the chewed remains so nothing is guessed.
Common questions
My dog chewed a ballpoint pen and his mouth is blue — is ink toxic?
The ink itself is minimally toxic and will mostly stain, but the plastic pieces are the real risk. Call your veterinarian or a pet poison hotline and check for missing caps or barrel parts.
My dog bit a printer cartridge and there is black powder everywhere — now what?
Keep him from grooming, wipe his mouth and paws with a damp cloth, and vacuum the area carefully. Call your vet or a pet poison hotline — toner powder irritates the lungs and stomach if licked or inhaled.
My dog swallowed a pen cap — should I make him throw up?
No — do not induce vomiting on your own, since a cap can lodge in the throat coming back up. Call your veterinarian or a pet poison hotline and watch for vomiting, gagging, or appetite loss.
More household hazards for dogs
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).