We've had this problem with our 3 yr old Aussie/Corgie mix and the new JRT...the thing that has worked wonders for us is called a Gentle Leader. It's actually a head collar. Check your humane society or local big name pet store. It works wonders. It's the same concept as a bridal for a horse, plus it doesn't put pressure on their throat! Love ours.

Hi Cesar,
I have a 9 months male JRT(my first dog ever, and I'm 42!!). He is so happy when I grab the collar and leash, I make him sit, and he stays. But he starts to pull very hard that he chokes himself and starts coughing hard, but keeps pulling. He is both anxious, and frightened, he goes with ears back, tail between legs, around my block or the next one.
When we are getting to a house where there is a dog he tries to avoid walking by. And there are lots of dogs in my neighbourhood !! So the walking is like a torture for me and for my arm and shoulder !! and not so sure if he likes it. If there are people around, he gets very happy and jumps on them, specially if they are kids, but this excitement causes fear in people... I'm experimenting with a choke chain collar now, but he doesn't care!! His fears are stronger than pain and he still pulls hard.
Should I use a harness? I still haven't tried my rollerblades with him because I'm afraid to fall and get hurt..., also I'm planning on making a backpack for him (those are not available in my country, or at least not for a Jack Russell size).
I watch the show and it's very useful and educational. I love it. You are great!! I wish I can be like you =) also, I wish you come to my country.
Regards from Argentina!

I have two male jack russell terrier. Befor we go on the walks i grab their leashes they go crazy and overexcitement and during the times we was putting on their leashes and collars. we use harneless cause the last time we use collars they pull and choke themselves. What should I do to calm the two male jack russell terrier before we go for a walk.