Johnny Manziel's Fiancé Bre Tiesi Bitten In The Face By Dog

Johnny Manziel's fiancé Bre Tiesi had a bad run-in with her dog that left her in stitches...

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Per TMZ Sports...

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Bre detailed the scary incident on social media -- saying her lip was "legit hanging off" after she tried to break up a canine throwdown involving her two pups.

But the IG model wasn't about to let a random ER doc mess with her kisser ... so she hit up Garth Fisher -- a Beverly Hills surgeon who's worked on Kris Jenner -- and he stitched her up, good as new.

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Poor girl...