i just fed my dog chocolate, then i read online that it can kill them, it only had one tiny piece though, is it gonna be ok?

should be ok. Just don't give it raisins or grapes. If your dog has ingested large quantities of raisins or grapes, (s)he will immediately begin to vomit repeatedly, and will become extremely hyperactive and jittery. After about 24 hours, the dog will become lethargic and depressed. (S)he may experience abdominal pain and may stop urinating, drinking, and/or eating. (S)he will also become dehydrated. Both his/her vomit and feces will contain partially digested raisins or grapes. His/her breathing may become irregular, and (s)he will also become hypercalcemic (high calcium concentrations) and hyperphosphosphatemic

Ultimately, without treatment, the dog will go into renal (kidney) failure, and may die a horrible very painful death. Of the ten reported cases, only five dogs survived, and these only with early, aggressive, and long-term treatment.

Probably but keep an eye on him.
And do yourself, and your buddy, a BIG favor and learn what dogs can't eat.

[c=#800055]a lil is ok, maybe give him water to dilute it in his stomach? [/c]

A little bits alright