Answer: GRRS

AnswerCrossword Clue
GRRSKennel sound effects.
GRRSShepherd's warnings
GRRSHounds' sounds
GRRSCujo's warnings
GRRSSounds mailmen fear
GRRSToy warnings?
GRRSWarning sounds from Fido
GRRSRover's warnings
GRRSShelties' surly sounds
GRRSDog noises
GRRSDog sounds
GRRSKennel sounds.
GRRSCanine sound effects.
GRRSPound sounds
GRRSCanine comments.
GRRSCanine sounds.
GRRSWatchdog's stock in trade.
GRRSCanine expressions of anger.
GRRSWatchdog warnings
GRRSBoxers' warnings
GRRSCanine warnings
GRRSLab alerts?
GRRSSurly sounds
GRRSWarnings from the doghouse
GRRSDoghouse warnings