You shouldn't pick up strange animals.
Jack is walking down the street when he notices a small, stray dog, likely a chihuahua wandering around.
Jack wants to get the dog out of danger.
Jack whistles for the dog to get it's attention and runs in the opposite direction hoping the dog will chase him and run off the street.
Jack runs towards the dog, and before the dog can react, Jack grabs it and picks it up to try to remove it from the road.
The dog thinks Jack is playing a game and happily barks as he runs after Jack, getting off the street in the process.
The dog in the confusion thinks Jack is attacking it and bites Jack's arm violently, causing a terrible wound.