Tanner is a blind golden retriever whose life almost ended when his owner died. Blair is a black mutt who got shot and used to live in fear. Then they found each other, became best buddies and solved their problems together.

Their story defies belief. If it doesn't make your heart melt into a mass of bubbly love, you clearly are a psychopath.

Tanner is a golden retriever who was blind with cataracts from birth. He had a slight seizure problem, but his owner took care of him and everything was good. He was a happy dog.

Then, his owner died.

His world was turned upside down. Without his human buddy, Tanner didn't know what to do. He was in a permanent state of stress. The panic he felt from not having him, his help, his presence, by his side made the seizure problem really bad. A golden retriever rescue group in Oklahoma—the Sooner Golden Retriever Rescue—put him in a home with a woman named Jill, but Tanner still had serious problems after that.

The seizures were becoming truly horrible. As his vet says: "he would defecate, urinate, seize in it... it was bad, there's no question about it." In fact, the vet recommended to put him to sleep quite a few times.

And then everything changed. One day, Tanner went to the rescue's playground and, by chance, he met Blair—a black mutt who was shot when she was younger, becoming timid and fearful.

They instantly bonded. They became best friends forever, on the spot.

In fact, Blair became Tanner's service dog. You see, Blair knew something was wrong with Tanner. According to the veterinary, she clearly knew Tanner was blind. "Oh yeah, I don't think there is a doubt," he says "I've never seen anything like this... ever."

The link was established and they became inseparable. Blair walked Tanner around, carrying his leash in her mouth. And Tanner calmed down: since the moment they met, he didn't have a seizure ever again. And the same happened with Blair: she became happy and friendlier. A "remarkable synergy between both of them," says the vet. This story shows how little we know about how animals' brains work, both individually and in their relation to each other. [The Dogs]