Can you direct me to an article that would tell me how to teach then how to walk on a leash? Should we not let our dogs play with toys together? How much 'play/fighting' should we allow?

Dear Cindy,

I want to thank you first of all for answering my questions a few weeks ago. I received the puppy training video and Establishing pack structure one and am nearly through the puppy one but not very far on the other one. We have a 4 month old puppy and a 4 year old mutt who looks and acts like a Jack Russell. Your information has been so helpful. I have several questions concerning how these two dogs may/should interact. 1. Can you direct me to an article that would tell me how to teach then how to walk on a leash? We have a fenced in back yard and never took the older dog out but now I want to teach her to walk on a leash and train her, and of course the puppy also. The puppy has a collar and I started letting her drag the leash around. I will get a lightweight collar for the older dog this week but just wanted to know if I'm doing things right before I start the older dog.
2. Should we not let them play with toys together? They usually don't play with the same toy and if they do they seem to know when to back off. We never leave them alone together but if this is a bad idea we will stop it. 3. How much 'play/fighting' should we allow? The puppy is pretty feisty and reads the older dog (who can also be feisty) pretty well also usually knowing when to stop. They will also stop when I tell them to. 4.We have a large, fenced in back yard--when would it be alright to leave them outside together as Sunday's we're gone most of the day. We do have a fenced in kennel in the yard where we could put the puppy--would that be the better idea?
Hope this isn't too long and I thank you for your great information. I feel like a sponge but can't quite absorb it all!

Warmly,
Julie
Timisoara, Romania