Cats in Iowa, United States: rules and travel
Dogs 6 months and older must be rabies vaccinated and owners are liable when a dog attacks or tries to bite a person.
Dog licensing, leash and many breed rules are set by counties and cities; check the local animal control office.
The national rules for United States apply here too. National rules
Laws change: this is general information, not legal advice. The authority linked on each line has the final word.