The owner or person in charge of an animal known to be vicious has a duty to exercise ordinary care to keep it confined so that it may not injure any person. The owner or person in charge of an animal known to be vicious, who negligently permits it to run at large, is at fault.

An animal is "known to be vicious," if the owner or person in charge of an animal knows of its dangerous inclination or, in the exercise of ordinary care, should have known of its dangerous inclination. * * * * *