that x might do for some people ,but dos,nt say your dog will ,if the dogs parents both did foxes then its in the blood ,but then it still dos,ent mean your dog will ,all you can is try ,but wait untill you think its ready,i would double fist few times and then you will know ready ,if it has it ,i,ve got 12 month old bull x its done 5 double up with its older brother who is 3 shot and retrived ,but still would,t let it do 1 by it self for another 6 to 8 month ,