Riddle 2008:2

A-standing on my tippy-toes,
As sentry I am thorough:
And if a whiff should meet my nose
My pointy face will furrow,
I’ll bark to rouse you out your doze
And scamper for my burrow.

I know, I know, requires American pronunciation. (For English, spell it furro’ and burro’.) And a bit of “bad English for the sake of meter” that needs fixing. No prizes for answering this correctly, but don’t look in the comments until you’ve worked it out if you don’t want spoilers.

Written this morning for a mate’s birthday.