Usually, dogs that have grown up in a shelter have various phobias. Having lived all their lives in the absence of many stimuli and having seen ten people all and all, the outside world, noises, sounds, unknown people frighten them, not because they have bad experiences of something, but because they have no experiences at all.

It's all unknown, so adaptation takes time because dogs are just scared.

He doesn't. He is not afraid of anything at all.

He really is not afraid of anything at all, and although he has been with us since he was a puppy, nothing impresses him, he never takes a step back, he never shows distrust of anything and anyone, known or unknown.

Also, he's one of those dogs that you take out a treat and suddenly becomes a show dog. He sits, lies down, looks you in the eye, you call him and run to you.

Everything he knows, he has learned in the shelter, with the help of volunteers and friends, and what little he has taken from us, he has assimilated everything and it's as if those few things he's learned he always knew. 

It's not that he doesn't do stupid things, of course he does, he's young, he's strong and he's an energetic and active dog.

But he has an incredible intelligence and a constant disposition to learn, to do, to know, and to show that he knows. Brian is a tall, strong dog, and although his daily life doesn't help him grow, he evolves anyway, as if he doesn't want to give up on anything.

He has an incredibly intelligent mind, which learns and assimilates very quickly. Life with him will probably not be easy in the first few days, for the same reason that very smart kids in school are not easy, but it will be incredibly rewarding, as he learns something new every day, and becomes more and more perfect.

Brian is the dog who, as soon as you take out a treat, stands clarinet as if to say, "Well, what do we do now??". As he grows and matures, his diminishes, and his cooperation becomes that of the mature dog, not the naïve puppy. 

With the right schedule, proper stimulation, i.e. daily walks, play for a few minutes outside the house, some training in basic commands that he loves because he likes to put his mind to work, and some simple rules for inside the house, Brian will become the perfect dog.