Dear Senor Member,

Thank you for your suggestion I will try. I agree, Renzo is a really good dog, if I may say so, he is compassionate. Even when he was younger and bit me I strated to yip, he joined me with howling at the same pitch and felt sorry for biting me. The same happens also now when we are inside, but outside he feels free to play as he wants (perhaps our exercises are only inside?). Also after long hours inside he is very excited and can't control his emotions. I understand that even when he tears my clothes he wants just to play.
November and December are the darkest months in this country. In working days we are walking in the darkness (it is dark from 3.30 p.m. and until 8.30 a.m.) and he feels more tense and frightened. We can not meet many people. But since the first days I got him he was very friendly at all people and later also to other dogs. When we walked and he noticed sombody coming, he ran to this person to get acquainted. Now when he meets dogs, he is always friendly and he wants to play.
The problem is that he becomes agressive on leash when we walk. Agressiveness became more intensive when we strated to exercise random walking (because of leash pulling). That day he became very angry. He jumped on me and started to bite me and tear my other jacket. I could not stop him for a long time. But next day, when we went to walk, his behaviour had changed a lot. He walked without hurry, but he was running from one side of the pavemenet to another. He understood from previous day that I am asking him to walk this way. Now walking is much easier and better. He does not hurry so much. Only when he gets frightened from something or and do not let him go where he wants or take in moth some garbage he jumps on me and starts biting and tearing my overcoat. I tried to cuddle him or asked him sit for a while. Sometimes it helps, sometimes not. More often we just go home and there he is again good dog (without leash). If you have any suggestion in this situation I will be very thankful.
Thank you once again for helping with the first question.

Best regards,
Ilga