犬は死んでいるよ。

dog (Canis (lupus) familiaris); snoop (i.e. a detective, a spy, etc.); loser; asshole; counterfeit; inferior; useless; wasteful

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

to die; to pass away; to lose spirit; to lose vigor; to look dead; to cease; to stop

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!