More, from our vet's pamphlet here in the U.S.:
"Grapes and raisins have often been used as treats for dogs. But it's not a good idea. Although it isn't clear why, grapes and raisins can cause kidney failure in dogs. And just a small amount can make a dog ill. Repeated vomiting is an early sign.
No matter how good you think the guacamole is, you shouldn't give it to your dog. Avocados contain a substance called persin. It's harmless for humans who aren't allergic. But large amounts might be toxic to dogs.
nions and garlic in all forms -- powdered, raw, cooked, or dehydrated -- can destroy a dog's red blood cells, leading to anemia. That can happen even with the onion powder found in some baby food. An occasional small dose is probably OK. But just eating a large quantity once or eating smaller amounts regularly can cause poisoning.
Grapes and raisins have often been used as treats for dogs. But it's not a good idea. Although it isn't clear why, grapes and raisins can cause kidney failure in dogs. And just a small amount can make a dog ill.
Dogs should not eat macadamia nuts or foods containing macadamia nuts because they can be fatal. As few as six raw or roasted macadamia nuts can make a dog ill. Symptoms of poisoning include muscle tremors, weakness or paralysis of the hindquarters, vomiting, elevated body temperature, and rapid heart rate.
Candy, gum, toothpaste, baked goods, and some diet foods are sweetened with xylitol. Xylitol can cause an increase in the insulin circulating through your dog's body. That can cause your dog's blood sugar to drop and can also cause liver failure.
Most people know that chocolate is bad for dogs. The toxic agent in chocolate is theobromine. It's in all kinds of chocolate, even white chocolate. The most dangerous kinds, though, are dark chocolate, chocolate mulch, and unsweetened baking chocolate. Eating chocolate, even just licking the icing bowl, can cause a dog to vomit, have diarrhea, and be excessively thirsty. It can also cause abnormal heart rhythm, tremors, seizures, and death.
The problem with these fruits is the seeds or pits. The seeds from persimmons can cause inflammation of the small intestine in dogs. They can also cause intestinal obstruction. Obstruction is also a possibility if a dog eats the pit from a peach or plum. Plus, peach and plum pits contain cyanide.
Before it's baked, bread dough needs to rise. And, that's exactly what it would do in your dog's stomach if your dog ate it. As it swells inside, the dough can stretch the dog's abdomen and cause severe pain."
But the article also states "...Slices of apples, oranges, bananas, and watermelon make tasty treats for your dog. Be sure to remove any seeds first, though…."