
Eu nao sei o que ja fez/experimentou, nao sou especialista, mas daquilo que contou, e sendo o animal grande e de dificil controle, é realmente complicado continuar a andar qnd o cao puxa noutra direcçao...
Acho que devia ter muita calma com ele, logo no inico, nao forçar a saida de casa...começar com passeios mt curtos e ir umentando a distancia gradualmente, visto que a medida que se afasta de casa o medo e o stress aumentam...e encontrei esto na net, explica melhor do que eu, e o caso parece mt semelhante ao seu:
"Question: My 15-month old dog, Harvey is afraid to go out on walks and will not venture far from the house. He does not like to walk near roads and pulls back if he hears noises such as traffic, people or children playing. How can I help him to overcome this fear? I really want him to enjoy going out on walks.
Answer: Dogs that have not got used to the outside world and all the things it contains as young puppies can have a lifelong fear of them that can be very difficult to cure.
Depending on the genetic make-up of your dog (sensitive breeds such as shepherds and collies are much harder to cure), this may or may be possible.
To stand any chance of success, it is important that you take things slowly. You may like to give him a week or two’s rest from going out at all to let him recover and to get rid of all the stress hormones he has built up.
During this time, play lots of games with him in the garden and develop a love of playing with a favourite toy. When you do begin to go for walks again, never pull or make him go further than he wants to.
If this means that it takes weeks to get to the end of your road, or even your path, so be it. Forcing dogs to confront their fears usually makes them worse rather than better, so take things at his pace.
Just before you have got to the point where you think he may have had enough, reward him well with lots of praise, a handful of tasty treats and a quick game with that favourite toy (if he is not too afraid to play).
Then take him home. In this way, he should begin to realise that walks are not quite the ordeal he thought and can actually be quite rewarding instead.
It may be a long process, particularly at first, but should get quicker eventually as his confidence grows. Something else that may help is to play him tapes of the noises he will hear on a walk that may scare him.
The Blue Cross have a good tape for sale as part of their Headstart for Puppies programme. Send a s.a.e. for an order form to The Blue Cross, Shilton Road, Burford, Oxon OX18 4PF.
Please also see Training for Life (everyday life) easy & fun training classes you can do at home, including:
Audio tape of noises your dog must learn to be unafraid of
Video on how to raise a friendly, well balanced dog that can cope with everyday experiences in the modern world
Explanation of training using rewards, toilet training, learning to be alone, chewing, adolescence, setting boundaries and saying ‘no, solving behaviour problems, tricks, games and having fun."
Fonte: http://www.dogbehaviour.com/behaviourpr ... /fears.htm