I love two hose/ball. Allows me to keep my dog engaged and get good exersise as well.
If you are having problems with the dog retrieving then only using one ball is going to make it worse. Especially if he gets corrected until he comes back into you.
With two hose/ball, start with the dog on a long line, throw the ball, once he has it, run backwards a bit, calling his name and activating the other toy. Since he is on a long line you can reel him in. If he gets chewy on the first toy, hold his collar and with the other hand activate the second toy. Make it waaaaay more fun that the first, the second he drops the first one, throw the second.
If your dog is not outing the first toy, you are not making the second fun enough. They need to learn that the dead toy stinks. It's the live toy they want.
I guess though it all depends on what you are using the game for. If it's training as a reward, then I would not be using two toy. If it's to excersise and free up your dog after a good session, then two toy is great.
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