Warning from a dog (5)

I think it could be either:

Which length description are you looking for?:

snarl

(Other definitions for snarl that I've seen before include "Bare teeth and growl" , "Growl aggressively" , "Growl in a threatening manner" , "Say something aggressively" , "A vicious angry growl" .)

I've seen this clue in the Newsday.

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