A story in the San Francisco Weekly ("Service with A Snarl [3]") describes Tita, a Chihuahua service dog who helps a man named Charles Esler deal with bipolar disorder. A happy, feel-good story, except for one thing: Tita bites. Tita regularly chases and lunges after people in public parks. She snarled and barked at a guard at the Social Security Administration. She bit Esler’s primary care provider. And during SF Weekly [4]’s interview with Esler? She bit the reporter.
 
"'She’s vicious,' Esler says with a smile, cradling the dog, which licks his face with abandon. 'If you were to approach a guide dog without acknowledging yourself, I’m sure a guide dog would bark, too.'"
 
Actually, no. In her recent article for Bark, "The Making of a Guide Dog [5]," Jane Brackman explains that  puppies who can’t learn appropriate ways to deal with stress do not get placed as guide dogs.

“All dogs are born with default positions that they revert to when stressed. The reaction can be anything from anxious whining to more serious issues such as biting. The higher the stress, the more pressure on the trigger. Puppy socialization programs provide an opportunity to identify environmental stressors and modify the reaction, or failing that, release the dog from the program to a companion home.”

Poor Tita! Training proper behavior is as much for the dog’s comfort as for the human who will eventually work with that dog. It seems inhumane to expect an untrained dog to feel relaxed and confident in public situations such as large crowds, public transportation, and all the normal places we humans don’t think twice about. Seeing Eye puppies are gradually introduced to all kinds of these things and carefully socialized from birth. This way, when they finally go out with a blind person, it’s no big deal to hop on a train, take a bus, be in a stadium full of screaming fans, or be around other dogs and new people. They’ve done it all and seen it all by then. Nothing bothers them. And if it does, they are rejected from the program and placed where they belong: in a companion home.