Hello Marina,
A 13 month od sehpherd is a strong dog that's not easy to control if he has not received proper education at a smaller age.
I would suggest walking the 2 dogs seprately at a first stage.
While walking Harry, stop the walk as soon as he starts to pull on the lead. The walk shall not continue until he stops pulling. Your walks risk not to be very long in the beginning as you will have to stop more than u will be walking.
Another technique that is useful to combine with this one, is the random walking (twice or thrice a week, it's very tyring for dog). While walking Harry, in an open space without major attractions, change directions suddenly every few meters. Like every 5 to 15 steps change your direction unpredictably. Do this exercise for no more than 20 minutes. You will be surprised by the results.
In your case, using a prong collar or a martingale would be efficient to be more in control. But never use a slip or choke collar.
It's a matter of days before you can walk both of your dogs together beside you.
Good luck.
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