Vegetables

Onions

Toxic for Dogs

Danger — seek vet help

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For Dogs

Toxic

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For Cats

Toxic

View cat safety info →

Symptoms to Watch For

Lethargy, weakness, pale gums, red or brown urine

What You Need to Know

Onions contain N-propyl disulfide which damages red blood cells, causing hemolytic anemia. All forms — raw, cooked, powdered, dehydrated — are dangerous. Cats are especially sensitive. Toxicity is cumulative.

Source: ASPCA Animal Poison Control

If your dog ingested this, act fast

Call ASPCA Poison Control: (888) 426-4435 or your emergency vet immediately.

View full emergency guide →

Safe Alternatives Your Dog CAN Have

Onions isn't safe, but these are vet-approved:

Frequently Asked Questions

Can dogs eat onions?

Onions is considered TOXIC for dogs. Onions contain N-propyl disulfide which damages red blood cells, causing hemolytic anemia. All forms — raw, cooked, powdered, dehydrated — are dangerous. Cats are especially sensitive. Toxicity is cumulative.

What are the symptoms if my dog eats onions?

Symptoms may include: Lethargy, weakness, pale gums, red or brown urine.

What should I do if my dog eats onions?

Contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 immediately. Do not induce vomiting unless instructed by a professional.