Joe, I think you've gotten some WONDERFUL advice here,,and I'm going to throw my 2cents in hopefully without getting lengthy, and what I've learned from my two aussies (and never having been an aussie owner prior).
They ARE an enthusiastic HAPPY dog,,my aussies would have turned into 'turnips' if I used harsh corrections/prong collars on them..My female Jynx especially, while a toughie, is a soft dog at heart, and harshness would have put her into a meltdown.
Why do I know this? because having German Shepherds for almost 30 years who are, in my opinion, a stronger willed, thicker skinned dog, and training them a different way,,aussies are not gsd's and different methods worked MUCH better,,as in Positive methods..
My aussies respond very well to clicker training,,they learned more "trick" type things in the beginning FAST,,,before they really became polished in more obedience behaviors,,as in walking on loose leash,,not jumping on people,,not taking off and ignoring me...That came with time, patience ,,very short training sessions,,HIGH value rewards when training, and slowly introducing distractions..
Heck even at 9 yrs old,,my Jynxie sees a bird and I don't exist at times
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It's JUST an aussie
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I also agree with a poster who said,,dogs don't 'know' what your asking in the beginning,,I do/did ALOT of free shaping with them,,just sitting around,,they'd go into a "down",,,I would click and say GOOD DOWN! I ALWAYS had my clicker on me and good rewards.. Also when I'm training,,treats are always OUT of site,,(in my clicker hand) I don' show them a treat and say "do this" ,,they are hidden, so as not to bribe the dog into the behavior..
I could go on and on about what these aussies have taught me training wise,,but alot of it has already been posted...We have a 6mth old male aussie in our basics class, and he is a WILD man
),,,it's AGE,,and yours is just taking advantage of enjoying "life" at this stage.. If you push to hard, she'll shut down,,(I have seen it with mine)..
I highly recommend getting into a Clicker based positive training class..you won't regret it..It's not an overnite fix but with a good trainer,,you will gain alot of insite on 'how' to train...
as for leash pulling,,thisi s what I do with ALL my young dogs,,,it's dizzying,,and repetitious,,but it seems to work,,,(good for distractions to),,if the dog pulls,,immediately change direction (use a 6ft leash),,without SAYING ONE WORD,,keep changing directions and GO,,don't just walk,,walk briskly and confidently,,,when the dog finally gets in that place you want,,(I like a left side heel doesn't have to be perfect but no pulling),,I praise her to the winds,,and reward her,,KEEP GOING,,same with a distraction,,if she pulls towards another dog,,turn around and GET MOVING,,,again,,I keep my mouth SHUT,,until the dog is in the position I want them, and then I am telling them what a GREAT DOG they are and reward....
Ok,,done rambling,,slow down, breathe,,she is going to be a wonderful dog with age,,altho aussies sometimes NEVER grow up LOL
diane