Questions & Answers about Je li pas dobar?
Yes. Croatian allows you to form yes/no questions by intonation alone. Saying
Pas je dobar?
with a rising pitch will be understood as “Is the dog good?” However, using je li is more explicit and common in formal contexts.
dobar means “good” and here it’s a predicate adjective describing pas (“dog”). The neutral word order for “The dog is good” is Subject–Verb–Predicate, so pas je dobar. Even in questions you keep the same ordering around je li:
Je li (verb+li) + subject + predicate adjective?