Part of our guide to Picnic and Potluck Foods: What's Safe for Dogs.
Enter your dog's details for a straight answer sized to them.
Why Tuna Salad needs caution
Plain cooked tuna is not toxic, but tuna salad brings mayonnaise fat, high sodium, and, in most recipes, diced onion, celery salt, or relish. Onion is the meaningful one: it causes oxidative damage to red blood cells. Tuna is also relatively high in mercury, so it is not a food to give regularly.
Part of the Chicken Salad guide
For related dog-safety questions and product-by-product answers, see the complete chicken salad guide.
Signs to watch for
Vomiting, diarrhea, excessive thirst, lethargy, pale gums, dark urine
Related items
Check the exact item or ingredient before assuming two similar exposures carry the same risk.
What to do next
Check for onion and relish in the recipe, note the portion size, and call your vet if allium was involved or your dog is small.
🚨Step-by-step: what to do in the first 10 minutes →Available 24/7. A consultation fee may apply.
A closer look at tuna salad
Plain cooked tuna is not toxic, but tuna salad brings mayonnaise fat, high sodium, and, in most recipes, diced onion, celery salt, or relish. Onion is the meaningful one: it causes oxidative damage to red blood cells. Tuna is also relatively high in mercury, so it is not a food to give regularly. The details below use the specific facts for this exposure, rather than treating it like every other food question.
1. Start with the exact exposure
For a closely related comparison, read Canned Tuna. Onion exposure is dose-by-weight and delayed, so a few days of watching is warranted. Mercury is not a one-meal concern; it matters if tuna becomes a habit.
2. Use the facts to decide whether to monitor or call
Another helpful reference is Egg Salad. A small amount of onion-free tuna salad in a healthy medium or large dog is usually just monitored. If onion or relish was in it, if a small dog ate a real portion, or if you see pale gums, dark urine, or lasting weakness.
3. If the details are uncertain
Follow the first 10 minutes guide. Check for onion and relish in the recipe, note the portion size, and call your vet if allium was involved or your dog is small.
FAQ
Onion exposure is dose-by-weight and delayed, so a few days of watching is warranted. Mercury is not a one-meal concern; it matters if tuna becomes a habit.
A small amount of onion-free tuna salad in a healthy medium or large dog is usually just monitored.
If onion or relish was in it, if a small dog ate a real portion, or if you see pale gums, dark urine, or lasting weakness.
- ASPCA APCC, people foods to avoid feeding your pets (onions, garlic and chives; fatty foods; salt)
- Pet Poison Helpline, onion and garlic toxicity
- Merck Veterinary Manual, Allium species toxicosis
- ASPCA Animal Poison Control: people foods to avoid feeding your pets
- Merck Veterinary Manual: food hazards