Answer: boxturtle

AnswerCrossword Clue
BOXTURTLE

Critter in a domed shell

BOXTURTLE

Tennessee's state reptile

BOXTURTLE

Shelled omnivore

BOXTURTLE
Pet that hisses when frightened
BOXTURTLE
Spar with a pet?
BOXTURTLEShelled North American creature
BOXTURTLEHard-shelled critter