Capitan, a German shepherd, reportedly ran away from home after its owner, Miguel Guzman, died in 2006. A week later, the Guzman family found the dog sitting by his grave in central Argentina.

Captain's family, Miguel Guzman adopted Capitan in 2005 as a gift for his teenage son, Damian. And for the past six years, Capitan has continued to stand guard at Miguel's grave. The family says the dog rarely leaves the site.
The family has took Captain home but he always runs away and returns to Miguel's grave.

In January, Mark left his dog with his dad in Virginia because he couldn’t have a dog at his home in Myrtle Beach.
But a short time later “Bucky” went missing and set out on a 500 mile journey to find Wessells. The dog was taken in by a family in Carolina Forest that brought him into an animal hospital in the Grand Strand. When they learned “Bucky” was microchipped. they called Wessells.
How “Bucky” made it to South Carolina is still anyone’s guess.

17-month-old Charlotte Svillicic was playing in the backyard of her family's Australian home, the family’s Doberman pinscher, Khan, began to snarl.

A king brown snake (the third most venomous kind in the world) was under the house. Khan tried to nudge the toddler away, but when she didn’t budge, the dog lifted the toddler by her diaper and tossed her several feet behind him, just as the snake lunged and bit his paw—instead of her. After receiving antivenin, the dog made a full recovery

When police officer Patrick Daughtery entered the home of Gary Rosheisen, he was surprised by what he found. Rosheisen had fallen out of his wheelchair and was on the ground near his bed; his tabby cat, Tommy, lay next to the telephone on the living room floor. According to police, a 911 call had come from the apartment.
When the dispatch department heard silence on the line, they decided to check the home. Rosheisen later said he had tried to teach Tommy to call 911 years before, but was unsure whether it worked.

Winnie the cat is really a hero cat, this cat saved lives of her family, when gasoline powered water pump in family basement produced a deadly gas; Winnie made her family wake up by her continues meows and saved their lived.

Jo Ann Altsman suffered a heart attack while vacationing in the north woods of Presque Isle, Pennsylvania, USA. LuLu, a housebroken Vietnamese Pot-Bellied pig came to Jo Ann's aid. LuLu took one look at Jo Ann and after 'crying' for a moment, she managed to push open the gate to get to a nearby road.
Witnesses reported that LuLu would wait until a car approached, then calmly walk out into the road and lay down in front of the oncoming vehicle. When a driver failed to stop, LuLu would return to Jo Ann to check on her, and then leave again to try and summon help. After about forty-five minutes the determined pig finally managed to persuade a young motorist to stop and follow her to the Altsman's mobile home. The man telephoned the emergency services and paramedics quickly arrived.