Seems like everything is right that's been commented.
Really the issue is trainablilty vs madness vs prey drive.
If you made the classic triangle system you generally see they are interlinked. More prey drive more crazy. Easier trainablity/calmness less drive.
My old man is a dog trialist. They cast off alot of eye dogs. The prey drive has to be top level. Unfortunately this means alot of dogs have some full on crazy brains. Find the ones that are calm and with drive and you train a champ.
Mixing an eye dog with a gsp then having the around home 26 days a month is not going to be easy unless you're a champ at training.
I've tried a gsp crossed with a calm as pig dog this time. He's pretty good and reasonably calm. Definately lost some of the point though. Basically I got myself a fit slow maturing lab.
I've never owned a lab but if you don't need a great point and want a calmer pet then that'd be my bet.
Either way. You do you then train the shit out of it. I used the deer dog BP to get started this time and I think it wa sworth it. My previous goats dogs were not as good even though they did it full time. Go figure.
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