You hear so many stories of food that is good for your dog and food that can be classed as poisonious or very harmful to your dog, that in the end, you just dnt no wats gd for them n wats not! I've heard that a high quantity of broccoli can become toxic to dogs, but little of it is very gd for them. I have heard that salmon can carry a bacteria that whether cooked or not won't kill it, it isn't harmful to humans but can be deadly to dogs yet we can buy tins of dog food with salmon in it, i hv heard that u shldnt feed yr dog pork or turkey n that sweet potato is very gd for them (cooked).... What is gd for your dog and what isn't????

The Internet can be as much a blessing as a curse in its spread of information or moreover mis-information!
It's not easy to sort fact from fiction (rumour is half way round the World before the Truth has even got it's boots on!)
  Even then a search can throw up 'credible' articles even citing clinical research papers... But some of which may have subsequently been debunked and the particular web page you're looking at has not been updated.
   It's not easy... But like anything on the Internet the general rule is 'check it's from a credible source' AND up to date!

That said there are the universally recognised foods that can cause harm:
(But note for many it's quantity and dose and that in relation to dogs size!)

Interestingly the VPIS (Veterinary Poisons Info service - used by Vets not for public access, although they have a good website the public canaccess.) lists only Chocolate, grapes/raisins/sultanas and Xylitol in its top ten of most calls from vets.

1) Chocolate - containing theobromine (the darker the chocolate, the higher the cocoa solid level the higher the theobromine level) white chocolate doesn't count! It's not actually chocolate! Merck veterinary manual ( you can look at this on google books) states aprox 1.3g/kg b.wt causes toxicity symptoms e.g. 25g bar of cooking chocolate would bring out symptoms in a 20kg dog.
[B]Note: clinical paper Drolet et al 1984 found a dog that had ingested large amounts of garden mulch made from cacao bean shells developed severe convulsion and death resulted after 17hrs.

2) Raisins and Grapes - Toxin unknown but research paper Sutton and Campbell 2006 & Cambell 2007 found fatal cases of renal failure resulting from 10 to 57g of fruit per Kg body weight.(Merck veterinary manual uses this too)

3) Onions - thiosulphate is the toxin bandied about on the Internet but (Thrall 2004 research paper) identifies principle toxin as n-propyl disulphide (The papers from Tang et al 2004, Lee at al 2000 and Yamato et al 2005 and this one debunked the popular Internet myth that Garlic was the same as onion for thiosulphate toxicity, no dog developed haemolytic anaemia ... Garlic in normal small quantity is fine)
Onion toxicosis is consistently documented in dogs ingesting more than 0.5% of their body weight in onions and daily feeding of small amounts will have a cumulative affect.

4)'sugar free' foods (chewing gum, sweeties) - contain Xylitol which can increase insulin levels causing dog's blood sugar level to drop. (Thomas and Boag 2008)

5) Macadamia nuts - toxic compound unknown but research paper by Dr.Ross McKenzie (Veterinary pathologist) found locomotive problems (skeletal muscle tremors) after as few as 6 shelled Macadamia nuts but for some dogs symptoms did not onset until after 40. ( Knott et al 2008 clinical research paper)
(hansell et al research paper 2000) states toxic dose ranges from 2.4 to 62.4g per Kg body weight!!
Merck veterinary manual states dogs are the only species this toxicity has been reported!

6) Avacado - Toxin Persin, triggers fluid accumulation in lungs and chest and can occur in heart and pancreas (Bouro et al 1994 clinical research paper)

7) Broccoli - the large quantities you mention is generally cited at over 10% of dogs diet

8) Tomatoes (the green parts!)  - and Potato are solanum species  (members of the nightshade family)Solanine and  Atropine are the toxins.

9) Corn on the Cob - not toxic but still according to RVS, one of most common causes of intestinal blockage complications.

10) Fruit pips and stones - Cyanogenic glycosides (cyanide poisoning)

Then whilst not 'toxic' foods that can cause digestive upset gastroenteritis  or worse pancreatitis:
Certain breeds more susceptible than others.. And even among dogs of a susceptible breed not every dog will be intolerant!

Milk - dogs don't have enough amounts of lactase ( the enzyme thst we have that breaks down lactose in milk)
Fat trimmings,gravy,bacon, turkey skin, dripping - pancreatitis

Then, talking of breed specific....
My Husky does great on some Mackerel,Herring and Sardines but JeanGenie's Dalmatians would not!
High purine foods (the fish listed above as example) are to be avoid in breeds or dogs prone to stone
forming.

Moral of the story:
Know your breed, knowthe lines/dogs your dog came from (which is why I'd never buy from 'the lady down the road who has bred her two dogs'/back yard breeders/puppy farmers/ pet shops/ or idiots!) so you know what your dog is likely to do well on and what it might not do well on <~ a breeder worth their salt (and your hard earned money!) should be able to tell you this.
And if your doing Internet research find out where and who the facts came from!
(I like the free database PubMed for checking research papers www.ncbi.nih.gov/pubmed from the National Library of Medicine US)

HTH ;-)

Note: VPIS veterinary poison service is UK based (formerly part of Guys hospital)

Hi huskygal!, thank you for yr reply. Everythin u hv listed, i hv read on the internet prior to coming on here but then i vested aother forum b4 comin on here n read wat some ppl r feeding their dogs, i.e. Steak, curry, salmon etc etc, i no that, same with humans, stuff that a dog can n cannot differs from dog 2dog, but curry n full surloin steaks, i cldnt believe it, n again, same with humans, stuff eaten in moderation is ok but too much of stuff can make us ill. My boss takes their 2yr old staffie to work every day, they let him chocolate,  muffins, cupcakes, the  lot! His daily dinner consists of a bowl full of dried food mix n about 4-5 sausages cut up n mixed in, it mortifies me coz he isn't growing n is ill quite often! Thank you again,