Tomatoes
Although they're a tasty snack when they're red, before they're rip, tomatoes play host to a dangerous chemical...
Seeded fruit
If you have a hoovering hound, watch out for seeded fruit, it can be dangerous! Although, when managed properly, if can make a tasty snack.
Potatoes
Eaten raw, potatoes are potentially very dangerous (not to mention how much tastier they are when they're in stolen chip form)!
Grapes
Commonly known, grapes (and raisins, sultantas etc) are highly toxic to dogs
Rhubarb (leaves)
The leaves of the rhubarb plants are highly toxic, and can cause kidney failure
Alliums
if it looks, smells or tastes onion-y... steer your pup clear! Anything that is part of the allium family (onion, leeks, garlic, chives) is toxic to dogs.
Always contact your vet
Understanding the dangers is key to recognising the risk, but if you're ever concerned for your pet, always contact your vet!