i got mine at 3 1/2 as he lived next to a farm and killed a sheep
if i had him from a pup he might be different, in 3 1/2 years the owner couldnt even get him to let go of anything, he wouldnt even sit hed just look at me like hed kill me lol
now he will instantly let go when i tell him although it took plenty of training, me getting bitten twice and 2 dogs nearly killed
hes like a different dog now,well behaved,99% dog friendly and alot stronger but his prey drive will never go