I don't care if that hamburger can kill me, I just want it really bad.
That hamburger has a lot of onion so it could potentially put the dog's life at risk.
ご質問ありがとうございます。
この場合、犬の表情で説明したいなら、「The dog really wants to eat that hamburger and has a face as if saying "I don't care if that hamburger can kill me, I just want it really bad."」という風に言えます。
もし、「[ハンバーグ](https://eikaiwa.dmm.com/uknow/questions/36538/)に玉ねぎを大量に使っているので犬が食べれば命に関わります」という情報も追加したいなら、「That hamburger has a lot of onion so it could potentially put the dog's life at risk.」と言えます。
ご参考になれば幸いです。