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I have a female doberman that just turned 1 year old recently.
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There is also a dog at the end of the road that wanders up onto our property every so often. She really hates that.
When a distraction like that is present she is completely focused on it and seemingly tunes me out.
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Invest in a really long lead and 'perhaps' a pinch collar. I say 'perhaps' because you may not need it.
Use the roaming / stray dog as a 'training aid' along with your long lead.
Continue to use the long lead until you are SURE your dog will stay on your property (unless told it can do otherwise) and follow your commands no matter what.
I had mine out front yesterday morning for their first potty break of the day at 6AM and a stray dog was standing in my neighbors front yard barking like mad at my girls the entire time. Really pissed me off... This likely pissed off my neighbor lady too as the stray was very near her front porch while doing all the barking at 6AM.. What 'should have been a 2 minute potty break took damn near 10 minutes because of the stray mutt trying to stir up trouble. My girls listened and stayed in my yard as they were told but it took them a lot longer to go potty because they were so irritated by the stray dog being so close to THEIR yard. Once my girls got done I gave them the command for 'inside' but instead of going inside I made them SIT, STAY, and QUIET by the side door while I watched the stray through one of the bushes. (the stray thought we were gone)
As soon as I saw the stray get to about the middle of my yard and begin to lift his leg to piss - I sent my best listener to GET his ass. (she was the dog most agitated by his presence as well) I allowed her to chase his ass down the street about three houses or so before I called her back. Any longer and she would have caught up completely and got him - Was VERY close already at the point that I recalled her. Her coming charging around the corner like that and then making a VERY growly / barky beeline for the stray made him piss on himself some as he was trying to get the hell out of dodge...
I successfully used that stray dog to work on a pile of different commands with MY dogs. QUIET, WAIT, STAY, GET, STOP, COME, etc...
Until you have STOP and COME proven 100% with your dog - Continue to use the long lead to make sure that YOU can physically STOP your dog if need be. You never want to get into the habit of allowing your dog to just blow off or ignore your commands. The long lead is there to help you make SURE that your dog responds.
If using your Doberman to run strays out of your yard like I describe above you also need to consider how long the other dogs legs are and how much warning he gets before he notices that your dog is after him. A short legged dog will be overtaken fairly quickly by a long legged Doberman and won't even have a 'chance' to get the hell out of your yard while a dog with longer legs that 'sees it coming' will be able to get away before YOUR dog / dogs get to your property line and STOP. (your should have no issues teaching your Doberman where the magic 'property line' is in your yard if you have patience and practice with them as often as possible)
I raised my Dobermans with some of the longest Flexileads I could find at the time. Got them used to the idea of following commands from a distance... Became very natural to them over time to think 25 feet away was the same as 6 as far as my ability to control them by having them on a leash. Flexileads are PERFECT for 'around the yard' boundry line training in MY opinion.