その犬は病気らしい。

that (something or someone distant from the speaker, close to the listener; actions of the listener, or ideas expressed or understood by the listener); the; um...; er...; uh...

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

illness; disease; sickness

seeming ... (expresses judgment based on evidence, reason or trustworthy hearsay); appearing ...; -ish; like a ...; typical of ...; appropriate for ...; becoming of ...; worthy of the name ...