Yes, they are part of our family, and we want to share not only our bed with them; we want to share our table food as well, but before we do, let's consider this: what if this food is poisonous to my furkid?
Below you will find a list with some of the human foods that are toxic to dogs and what they can cause if ingested.
Grapes and Raisins: it is unknown what the toxic agent is in these fruits, but they can cause irreversible damage the kidneys, possibly resulting in death.
Onions, Garlics, and Chives: they contain the toxic ingredient known as Thiosulphate; a chemical that causes the destruction of red blood cells in dogs. Affected red blood cells can rupture or lose their ability to carry oxygen effectively. It is important to keep in mind that the effects can be cumulative.
Xylitol: an atirficial sweeter most often found in products such as sugar-free foods, candy, gum, toothpaste, and mouthwash. It is harmful to dogs because it stimulates the pancreas to create insulin, resulting in low blood sugar.
Chocolate, Coffee, and Caffeinated items: chocolate contains Theobromine, a compound that is a cardiac stimulant and a diuretic. It can adversely affect the heart, lungs, kidney and central system. Death can occur within 24 hours of ingestion. Caffeine is very similar to the toxic chemical found in chocolate, affecting the same areas of the dog's body system.
Fruit seeds and pits: peach, plum, and cherry pits, as well as apple seeds contain a toxin named cyanide. Signs of cyanide poisoning include vomiting, heavy breathing, apnea tachycardia, skin irritation, coma.
An specific fruit worth to mention as well is the avocado; its leaves, fruit, seeds, and trunk bark contain Persin, a toxin that can cause vomiting and diarrhea; and let's not forget about the fat content, which is not healthy for dogs.
To consider avoid: some foods while not considered toxic, can still be unhealthy for your dog. Try avoiding foods that are high in fat, sugar and sodium, and dairy as well. They can contribute to indigestion, obesity, and more.
I hope this list serves you as a good reference, use it whenever you would like, and of course, when in doubt, do an online search and always check with your vet.