I think that inquisitive thievery should be considered a Vizsla breed trait.
I've always found it odd, that by in large, if they steal something they're not supposed to have they're not destructive with it. Of course fresh venison would be an exception, or maybe not. It wasn't destroyed it was just eaten. ;D
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I don't have any problems with the girls, a command of "Out" and I get the object back. They see plenty of live and dead quail, do even birds aren't a huge problem, unless both of them are around. Then they're primarily trying to keep the bird from each other. Which is a bad habit and will be corrected this sumer.
A "trick" to try for folks that are having trouble getting ahold of their dog. Pretend you are Boris Karloff in the Mummy. Just keep walking at them. Dead straight lines, staring with your eyes boring holes into them. No talking, no running or chasing, no yelling. Just a flat neutral energy that they can't read, maybe just a hint malevolence.
When they give up, they will stay there and spit the object out, and when you arrive don't be surprised if you get a very submissive dog. Calmly take the object, and walk away as if it was a normal thing. No punishment, no praise, flat neutral. It may take some time the first few times you try it. Keep the pressure on them. Dogs read body language and "energy". When they can't read you it unnerves them. Be careful though because they may react defensively if you go too much over the top. Once you have the object, let the pressure off.
I'm not sure it would work with the venison though.
