Choose the right word to complete the veterinarian's amusing certificate for a pet.

Congratulations to Barnaby the bulldog! Out of all the pets in the clinic, he is officially the _____ dog because he slept through his entire check-up.

The correct answer is laziest.

When a two-syllable adjective ends in a consonant + "y" (like la-zy), we change the "y" to an "i" and add "-est" to make the superlative form.