Standard wax crayons (including Crayola) are made with pigments and paraffin wax — both considered non-toxic. Eating a crayon is unlikely to cause serious poisoning, but wax and pigment can cause GI upset and the paper wrapper can cause mild irritation. A large amount of crayon wax could theoretically cause obstruction in a small dog.
Not All Crayons Are Equal
| Crayon Type | Toxic Risk | GI Risk | Action |
|---|---|---|---|
| Standard wax crayons (Crayola, etc.) | ✅ Non-toxic | ⚠️ Mild — wax, pigment | Monitor — call vet if symptoms |
| Washable crayons | ✅ Non-toxic | ⚠️ Mild | Monitor |
| Oil-based art pastels/crayons | ⚠️ Variable | ⚠️ Higher oil content | Call vet — check brand |
| Industrial/marking crayons | ⚠️ May contain toxins | Higher risk | Call Poison Control |
| Fabric crayons / transfer crayons | ⚠️ Variable — check label | Variable | Check MSDS sheet or call vet |
| Multiple crayons (large amount) | Low toxic risk | ⚠️ Obstruction risk | Call vet if large dog ate many |
Symptoms After Eating a Crayon
✅ Coloured poop is normal and harmless
If your dog ate a red, blue, or green crayon, expect coloured stools for 24–48 hours. This is simply the pigment passing through the digestive system and is not a sign of danger.
Frequently Asked Questions
No — Crayola and most major-brand children's wax crayons are made with non-toxic ingredients. They carry the AP (Approved Product) seal indicating they are non-toxic.
Standard crayons — a single crayon is very unlikely to cause anything beyond mild GI upset even in a small dog. A large dog eating an entire box may develop some GI upset but is unlikely to face serious consequences. Watch for obstruction signs if a small dog ate many.
Monitor for vomiting, loss of appetite, and signs of GI obstruction (straining, bloating, abdominal pain). Call your vet for guidance based on your dog's size and the quantity eaten.
No — this is completely harmless. Crayon pigment passes through the GI system intact and colours the stool. It should return to normal within 24–48 hours.
Industrial marking crayons, grease pencils, and specialty art media may contain different pigments or solvents. Call ASPCA Poison Control at (888) 426-4435 for guidance.