The Verdict: Not eligible
You do not need a working holiday scheme: as an EU, EEA or Swiss citizen you can live, work and study in Croatia freely. If you stay over three months, register your residence with the local police administration.
None of the working holiday limits apply to you: no ban on permanent jobs, no three-month cap with one employer, no limit on courses, and no once-only rule.
Registration gives you a registration certificate. If you also hold a Canadian or New Zealand passport, travel on the EU one.