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I don't get your meaning, it's probably just me, but all my dogs have slip leads and I have never felt the need for anything else.
Putting a slip lead on Barry the diminutive psychopathic furball might be a little challenging. My approach to the owner might be less than LFGSS approved, nor would it be appropriate for the peaceable @owl, but it would stop the nonsense and save me from having to stamp on Barry (who isn't to blame, he's a dog not a human).
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If you are going to throw a slip line on someone else’s dog, whilst trying to catch it, whilst it may be fully aggressing another dog…. Good luck.
That’s a lot of speed and movement while you are under stress.
Any stress situation relies on muscle memory. The more practice at catching the dog, getting a loop over a moving head, the more chance of success in the moment.
If slip's the way forward, definitely get some practice in at home... you'll need the muscle memory to work regardless of stress/adrenaline.