I just saw this on our local news but it happened in Canada. An 18 month old Golden Retriver saved an 11 year old boy from a cougar attack. The story is amazing.
Family's 'Angel' dog saves boy from cougar attack - CNN.com
This part isn't in the link I posted but the boy said his dog 'Angel' kept following his every move as he collected firewood in his backyard and he didn't understand why she was acting so protective and suddenly a cougar came out of nowhere running straight for him.
Angel jumped over a lawn mower and raced to put herself between the boy and the cougar.....the police said the attack lasted for almost 15 minutes.... This dog fought HARD - police were called and the cougar was killed. The best part is .....ANGEL LIVED
Had this attack been on the boy he could easily have been killed. This dog has the
perfect name - Angel