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On the whole critter issue, teaching the dog to retrieve is fine however IMHO, you need to work on his taking off first and separately.
When my Mal was a pup, she would run after the cats. And since she was my first Mal, I thought, "Oh, she will be like the other dogs and I can teach her to get used to the cats." YEAH, that went over like a lead balloon.
She got worse, and here I was, trying to recall her and she just gave me the finger. Same with cows, deer, or anything that jumped and ran.
Finally she killed her first two cats. They had gotten into her kennel.
Since it got into her kennel, and I was not home when it happened, there was really nothing I could do.
Then she got the third one while I was in the day yard cleaning, it was my favorite indoor/outdoor cat. Well, interestingly enough, she grabbed him, carried him around and would out when I told her to, but as soon as Isadore moved, she would grab him and run off again......finally I got to the cat when he was not moving and claimed him as mine, put her in a down and then picked the cat up and carried him to the house.....therefore saving him, although he was in the house mending for a week or more. She never did puncture or tear the cats up, just grabbed them and carried them around.
I got out the e-collar and had it on her, determined to "fix" this issue on the advice of someone I trusted in the "dog world.
So, I set her up. We went outside and we were working a down stay when a cat came out. She instantly broke and I let her get the cat, and then, without saying a word, I fried her. She spit the cat out, and stopped, went after the cat again and got it again.
While this method works, it is not the route I would go again unless it turned out to be the ONLY way.
Finally she stopped, and came towards me......to which I made it really fun for her to come to me and play tug even though I wanted to throttle her.
She now will avoid the cats (unless they are stupid enough to go into her day run and I am not home). Not that I like avoidance, but it is better than the alternative and now, with conditioning to the collar and working really hard on my recall, she leaves all running things alone.
Last night, I had her out while I was cleaning kennels and she was laying there mouthing on a length of PVC she had drug out from somewhere and a couple of the wild cats came out, she broke but when I said "fooey-leave it" she stopped and went back and got her PVC and came to me.
It is my fault for not doing it correctly the first time, but I call it progress that she is at the point that she is. She is getting better and I owe a lot of it to this site, the information here and the people....not to mention working hard and not getting frustrated and pissed off at her.
I am not saying this is how to "fix" your dogs issues, as there are better ways as I am happy to be learing. But, trying to start something new without working on problems that are existing, may only make the dog worse.
Trying to train with Jesea, with the worry of "what is she going to chase next" really bothered me and if you have those thoughts then your mind is not clear for the training you are trying to accomplish.
Until The Tale of the Lioness is told, the Story will Always Glorfy the Hunter