This Denver TV morning show host, Kyle Dyer, was doing a story on Max an 85 pound Mastiff (peet: that is how they describe him, but this looks more like a pit mix to me) who had been recused by firefighters after falling into a frozen pond.
During the live segment Dyer is kneeling and petting the dog who appears to be as happy as can be, and then he snaps at her. He reportedly gets her on the lip. Dyer was treated on the scene by the firefighters that were there, and is now in the hospital getting treatment.
There isn’t anything gory, and she goes off camera as soon as it happens. When they cut away to her co-host his freaked out expression is pretty hilarious because he’s trained to go on, but you can tell he’s worried and doesn’t know what to do.