It's hard to say what mix or percentage is in any dog if you not see the parents and even then you only have breeders word ,
get pup into a inclosed area and get recall training started and I'd be walking around sheep ,cattle ,horses as much as possible as stock training is a must for any working dog ,
I don't like long leads ,they do more damage than good in my opinion so if it was me that would be gone and have pup on short lead .
Enjoy he looks a nice pup