Humans may love the flavors of garlic and onion to spice up their food, says Susan Konecny, RN, DVM and medical director of Best Friends Animal Society®, but giving garlic and onions to your pet can cause health problems. In severe cases, it could even kill your pet.Uh, people, garlic is not poisonous to dogs. In fact it is put on some dog food and supplements.
http://www.petguide.com/health/dog/the-shocking-truth-about-dogs-and-garlic/
WHY ARE ONIONS AND GARLIC BAD FOR DOGS?
"Any member of the Allium familyonions, garlic, leeks, and chives are the most common reported to cause toxicitycontains N-propyl disulfide, says Dr. Ann Hohenhaus, staff doctor at NYC's Animal Medical Center. This compound damages the oxygen-carrying substance found in red blood cells called hemoglobin.
This kind of damage can cause red cells to rupture and be cleared from circulation faster than normal. This condition, hemolysis, results in anemia and red or brown urine. In severe cases, the anemia may lead to internal organ damage, organ failure, or even death, says Konecny. If your pet has eaten any garlic or onions he or she may also experience gastrointestinal irritation.
HOW MUCH GARLIC OR ONION IS TOXIC TO DOGS?
"Consumption of as little as 15 to 30 g/kg in dogs has resulted in clinically important hematologic changes, says Hohenhaus. Onion toxicities are consistently noted in animals that ingest more than 0.5% of their body weight in onions at one time. So, think that one fourth of a cup can make a 20-pound dog sick.
http://m.petmd.com/dog/conditions/toxicity/are-onions-and-garlic-bad-your-dog
Crust is nothing but flour, your dog doesnt need that.crust is ok.
but feeding your dog human food by hand/from the dinner table will incur bad/annoying habits