If you’ve mixed your tuna with mayo and also added onion powder (common in many tuna salads), that’s a hard no. Onions are toxic to dogs, even in small amounts. Same goes for too much salt, which can cause excessive thirst and sodium poisoning. And pickles? They’re often packed with garlic and salt, so skip those too.
Can Dogs Eat Tuna With Mayo
So your basic “tuna with mayo” might be okay in a tiny taste, but the second you spice it up, you’re playing with fire. Keep it simple: plain tuna, no extras, and a very small smear of mayo if you must share.
A better way to treat your pup
Instead of handing over your tuna salad, why not make a dog-safe version? Open a can of tuna packed in water, drain it, and mash it up. Mix in a spoonful of plain Greek yogurt (good for their gut) or a tiny drizzle of olive oil. My friend’s golden retriever, Lola, goes bonkers for this combo—and it’s actually good for her coat.
You can even freeze the mix in an ice cube tray for a cool, fun snack on hot days. That’s way better than worrying about mayo-induced belly aches. Plus, you get to keep your own sandwich all to yourself. Win-win.
