RFID for pets,

Good photos of pet,

Photos of you with pet (handy to show ownership),

Copies of licenses, especially vaccinations, and "Certificate of Health,"

Contact info for vet,

Collars with IDs, even on cats, at least when evacuating,

Harnesses are more secure than collars,

A hard-sided, airline approved pet carrier, fully labeled, is extremely handy in evacuation situations, and is often required in "pet friendly" or "pets only" shelters,

Pill fob on collar with your temporary evacuation location/contact information and family contact info, copy of vaccinations and registration.