Make sure any human food your dog eats doesn't contain the following, which are toxic to dogs: onions, garlic, avocado, chocolate, grapes/raisins, mushrooms (even some edible for humans), sugar-free stuff containing Xylitol. Small amounts may be OK, but if repeated it can have effects on the dog's internal organs, especially liver and kidneys.

My dog has so many allergies that I absolutely will not feed him any people food. Too bad, because I still haven't quite gotten my dinners down to the amount I can actually eat, so I still have leftovers.

Watch out for fish (spawned out salmon or piles of fish guts) along streams, or fish that hasn't been thoroughly cooked. It can contain a parasite which contains bacteria that is especially deadly to dogs.