Answer:

bark

Answer	Crossword Clue
BARK	Kennel comment
BARK	Do some carny work
BARK	Give a carnival spiel

BARK	Large sailing ship
BARK	Reply to "Speak!"
BARK	Say "Woof!"
BARK	Fir coat
BARK	Mulch material
BARK	White part of a white birch
BARK	Tree coating
BARK	Fir coat?

BARK	Boxer's warning
BARK	Lab warning?
BARK	Sound from a hound
BARK	Dogwood covering, appropriately
BARK	Oak finish?
BARK	Tree part
BARK	Cork, actually
BARK	Lab warning

BARK	Warning from a doghouse
BARK	Dogwood cover, aptly
BARK	"Speak" response
BARK	Lab output?
BARK	Bowwow
BARK	Brusque response
BARK	Cork, essentially
BARK	Kennel call

BARK	Place where initials can be carved
BARK	Tree-hugging surface
BARK	Kennel cry
BARK	Tree's protective layer
BARK	Cocker's comment?
BARK	Boxer's call
BARK	It may be worse than a bite
BARK	... beetle (orchard pest)

BARK	Hound sound
BARK	Woody covering
BARK	Fir's "fur"
BARK	It may be worse than a bite?
BARK	Pound sound