At what age did your Thingy perfect her recalls? Well I picked her up at 13 weeks on 13/03/2003, she showed strong indications within a couple of weeks that hunting/chasing was what she wanted to do/fullfill her needs/self so I made the recalls from multi species chases goal after around 3/4 weeks of ownership.
She was doing well on the OB (obedience) exercise foundations leading to reliability of high drive 'in chase process' recalls by mid to late June that year but I remember clearly I had to slow down & stop any training by Aug 03 due to v hot weather.
I picked up again by early Sept & by appx end of Sept she was at a standard of me being able to mix a training exercise with some real life recalls from chases. It might seem from that video that Thingy has been recalled from her chases when that happened, of so, thats not the case at all, Thingy has
been allowed to hunt & chase game ever since the points I mentioned, but she also got recalled from some chases on a 'variable ratio schedual' of reinforcement (link 1) of both the "leave" & "recall" exercises, that gives a steady , reliable rate of success throughout life & Thingy was doing just that until she slowed down around late winter of her 10th year.
She now simply uses her nose sense a lot more than any of the other 2 (sight & sound) senses that initiated her activity levels. So, to sum it up, the "leave" command is the basis of an effective recall under all circumstances & situations, that exercise is very soon graduated into "leave"-"down"-"recall" from prey object to raise the threshold of temptation, some call it the triangle of temptation, some call it the "red light" "green light" exercise, the sole purpose is to give the dog as much freedom in its all to short & let it live its dream, a dream of which we can only watch but never be a part of. See link 2 for the red light green light exercise - its a silent demo but I wrote in whats going on:
Link 1
http://psychology.about.com/od/vindex/g/def_variablerat.htmLink 2, red light green light reinforcement exercise.
https://www.youtube.com/watch?v=42tNOWAbEE8.