Problem solved!
I am 100% satisfied with this product. It has the range to reach my very fast Doberman/Ridgeback, has a really good range of stimulation and the shape of the receiver makes the collar remain in the correct place on the neck, even during fast exercise. My dog responds well to a low level stim, but in those cases where there are extreme distractions it is easy to adjust the level up to where it is effective. Love the fact that both the transmitter and receiver is waterproof! Good product!