Tbh i think that statement is entirely wrong mate...a dog is born with good constitution whether he,s fast or slow ...look at some of the fen dogs..like shit off a shovel but very hardy and robust...thats because they have been bred that way for donkey,s years with the bad traits bred out. you can rear a pup as well as you like but if he constitutionally unsound then there,s nothing you can do to put it there...sure you can help him along a little with fitness..good diet and such but nothing and i mean nothing is going to alter the way he was born ...jmo..atb stabba
Dont really know much a