if your dog cant do things natural well it aint good enough kept dogs for over 20yrs or so and had plenty good experiences, it's all in the rearing and the time you put into them,,a dogs either got it or its not,but you can only do the best ye can for them i spend more time way ma dogs than a do ma other half n thts the way ye get the best out yer dogs FACT plenty running up verry steep hills a few times a weeks not long n muscleing yer dog up i.e plenty work............top greyhounds won top derby racing so why can our lurchers no perform to the full potential we want them to do with out