Question

select the one proper noun.
we just took our dog rico to the vet for a checkup.

Explanation:

A proper noun is a noun that refers to a specific person, place, or thing and is capitalized. In the sentence "We just took our dog Rico to the vet for a checkup," "Rico" is the name of a specific dog, so it is a proper noun. Other nouns like "dog" and "vet" are common nouns as they refer to general categories.

Answer:

Rico