Eggs are safe and good for dogs. Eggs contain phospholipids and riboflavin that are good for a dog's coat and overall health. Under cooked eggs should be avoided as they can contain salmonella that can make a dog sick and can cause a biotin deficiency in dogs.

Most people know chocolate is not good for a dog. A compound called theobromine which is similar to caffeine is responsible. A small amount of chocolate will probably only give your dog an upset stomach with vomiting or diarrhea. With large amounts, theobromine can produce muscle tremors, seizures, an irregular heartbeat, internal bleeding or a heart attack. The onset of theobromine poisoning is usually marked by severe hyperactivity.

Onions contain an ingredient called thiosulphate which is toxic to cats and dogs. The ingestion of onions causes a condition called hemolytic anemia, which is characterized by damage to the red blood cells. Onion toxicity can cause the red blood cells circulating through your pet's body to burst. While a little onion may not cause severe issues as it only damages a few red blood cells, onions at higher levels can kill a dog.

Grapes are also toxic to dogs. The consumption of grapes and raisins presents a potential health threat to dogs. Their toxicity to dogs can cause the animal to develop acute kidney injury (the sudden development of kidney failure) with anuria (a lack of urine production).

More Info: www.humanesociety.org