It's true that most owners don't know it but no no for dogs include grapes/raisins/chocolate/coffee/garlic/onions/macadamia nuts/cat food... looks harmless enuff but these can be deadly.

Avoid the sugary/salty stuff as well, it's not good for them.

The above are usually life threatening if your dog consume it in large quantities like the whole can of nescafe or a 1kg bar of chocolate.

It's ok to treat them with small amounts once in a blue moon... or switch to healthy alternatives like bananas or dog biscuit or ice cubes.

There is a bigger list here:-
http://www.peteducation.com/article.cfm?cl...&articleid=1030

I hope this helps!

edit: BTW feeding too much dog food will also cause problems like obesity and worst still bloat 

Lol, i actually feed my dog Baskin n' Robbins ice cream before (the blue colour lime flavour,forgot the name)
Its tongue went blue after eating...aiks, too much colouring.

Feed somemore and you might find out

Tell to be careful but don't want to listen feed their pets weird weird stuff that is not part of their natural diet.... if you wan't to treat your pet dog get him a lean piece of steak  or doggies biscuits