Join Date: Jan 2011
Dogs Name: Jack Sharp
Titles: CGN, BH
Dogs Age: Born 09-03-13
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Kudos to you for questioning the approach in the video and for seeking possible alternatives.
If I were you, I would go back to square 1 and reteach every command (not all at once, of course) using one of or a combination of the positive approaches that another poster suggested you look up. Take a look at more than one video and tailor the approach you choose to the needs of your dog (and note that your Dobe and your Lab may respond differently to the same method, so be prepared to be flexible and adapt your techniques). This will take some time, but it will be worth the effort.
And . . . do you use a release word? In other words, when your dog is in a down or a sit (or whatever), does she remain there until you give the release command (e.g., "okay" or "break"). If you don't use a release command, it would be a good idea to start incorporating this into your training immediately and to be very consistent about using this word, not only when training but also on the day-to-day occasions when you want your dog to down or sit (or whatever). Once you release the dog, praise, praise, praise and give the treat or the toy.
Once you're sure that your dogs really know the commands, you can start easing back on the treats or the toys -- but never on the praise. Always, always, always praise when your dog responds in the way you want. It doesn't have to be a party every time, but your dog needs feedback to reinforce behaviour.