[gemy]

In terms of spike collars, there is absolutely no need for a Yorkie to be trained with one.

How-ever large guard and protect breeds there is.

And each temperament of every dog is different.

Also you need to be trained in the proper use of a spike collar. You don't just purchase one, and go on to happily and "safely" use one.

I don't like Casear's dominance alpha in your face way of doing things, for all dogs.

He is 100% right that folks don't exercise their dogs enough, or train them enough.

Positive re-inforcement is great, but so is discipline and consequences for mis-behaviour. Imo for many dogs a mix of same might be necessary.

And I said this before, and again just my opinion, I would give a wide berth to any individual walking a largish dog on a Flexi Lead. Those things should be out-lawed for large breeds. You have absolutely zero control over that dog, and the handle and the small button to lock the lead is usually difficult to work in an emergency situation.
They have their use in early and continuing training situations with-in controlled environments.
But not for a walk in the park.