that sounds promising as i have the same problem with my 10 and half mth bull x she knows what i expect but doesnt always come back straight away ,mainly cause shes found some turd to shove her nose in although this is better than when she was addicted to horse shit and would grab a piece and tear arse round for 10 mins that was stressfull.
in the house she will retrieve every time usually to hand and outside she hit and miss some time she will bring it back other times she will torment me.it is hard when other people say ,my dogs 3 mth old and 100% but there all different i guess