answers to some of the questions. Again like mainy things when it comes to food it comes down to a matter of quanity.
here is a link to the article
20 Things You Should Never Feed Your Pet
1 tuna only pertains to cats taurine is not an efa for dogs as they can manufacture from other Fatty acids unlike cats.
2. Liver is high quanities only which causes vitamin A toxicity to get an idea what a large quanity constitutes see this article
The Dangerous(?) Vitamin A "Vitamin A is one of the two vitamins in which oversupplementation can have negative effects. However, we have never seen a case of oversupplementation causing toxicosis, and in dogs, toxicity has been demonstrated only under experimental conditions. Toxic doses of Vitamin A could produce muscle weakness and bone abnormalities. Realistically, oversupplementation or toxicity is virtually impossible unless mega-doses are given for long periods of time (months to years).""
a 40=60 dog to possible have Vitamin a toxicity from eating liver it would need to consume 2/3 lb per day for at least 2 months.
Liver is not a high level risk by any means.
Cheese is put is the same catagory as milk because some not all pets are lactose intollerant. Hmm That logic if it were carried out to humans would be don't eat dairy because some are intollerant.
Fat is estential for a dog it comes down to quanity. It is documentent over wieght dogs are more prone to pancreatitis as are certain breed which lead to the conclusion that genetic play a part also but just how much fat is not clearly known from
HIGH FAT RATIONS AND ACUTE PANCREATITIS "The precise mechanism that leads to the occurrence of acute pancreatitis in dogs has still to be fully elucidated. In one study dogs with liver disease fed a diet containing 77% fat on a dry matter basis developed acute pancreatitis1, however in another study2 sled dogs fed 66% fat for a 9 week period did not develop acute pancreatitis. The amount of fat needed to induce acute pancreatitis far exceeds the amount that is present in commercial pet foods (8-25%), but fatty foods (eg meat offcuts) should probably be avoided in dogs"
Ham the assumption that large intakes of water increase bloat risk are not born out in studies.
Risk Factors for Canine Bloat "There was also no correlation to vaccinations, to the brand of dog food consumed, or to the timing or volume of water intake before or after eating."
At least with the Onion and garlic she does admit garlic is much less risky there are many Vets well veresed and studied in canine nutrition that the health benefits of garlic out weigh the risk factor especial if one keeps it below toxic level wich is the case unless the dog is heavy supplemented
fruit Pits see
Hydrogen Cyanide"Cyanide is commonly thought of as a gas, but you also can be poisoned by it if you ingest wild cherry syrup, prussic acid, bitter almond oil, or large amounts of apricot pits. Cherry seeds, peach and plum pits, corn, chickpeas, cashews, and some other fruits and vegetables contain cyanogenic (i.e., cyanide-forming) glycosides (such as amygdalin) that release hydrogen cyanide when chewed or digested. As a result, some cyanide can also be found in fruit jams that contain these pit and pip extracts, such as quince. However, since the concentration of cyanide in these compounds is small, accidental cyanide poisoning from a food source is rare." and
Cyanogenic Glycosides and Cyanide Toxicity It does not discuss toxic effects occurring in people consuming foodstuffs, other than one example, again with cassava. And again there are no case studies reporting death from consuming cyanogenic glycosides. Given the extensive list of references to this study, this is presumably because they were unable to find any. and the
Merck Veterinary Manual Ruminants are more susceptible than monogastric animals
grapes
http://www.dogbreedinfo.com/grapeandraisin.htm" target="_blank">Raisin and Grape Toxicity in Dogs</a>
"... of the 10 cases reported to the ASPCA Animal Poison Control Center (APCC), each dog ingested between 9 ounces and 2 pounds of grapes or raisins."
GRAPE AND RAISIN TOXICITY IN DOGS "At this time, the lowest documented
toxic grape or raisin dose is 0.32 to 0.65 oz/kg
Mushrooms that are toxic to dogs are also toxic to humans. I don't think many people are out there feed unknown mushrooms to their dogs.
Caffeine the toxicity level for caffeine is 100-200mg/kg. A standard 16 oz coffee contain between 140-250 mg of caffeine, a dog would have to drink nearly a 1/3 of its own body weight in coffee,
As is often the case in most cursory examinations of diet there is more hype than actual fact. If we were to remove every food that if overfeed could cause death well any animal would end up starving to death.
I just read this list of 20 things to never feed your pet in the Sunday, Sept. 2, 2007 edition of the Parade Magazine. The article was written by Karen Halligan, a veterinarian. 
