Some buddhists are vegetarians and some are not. It all comes down to personal choice and preference. It is impossible to obtain food that has not been produced at the expense of sentient beings. We can only be responsable for our actions and bring about a maximum of care for others.
This is a big debate. I suggest you search using Google for differing opinions to mine ;-)
"You are what you think. All that you are arises with your thoughts. With your thoughts you make the world. Speak or act with a pure mind and happinness will follow as the wheel that follows the ox which pulls the cart." The Buddha.