dog out in the yard should be far fitter than some dog on the sette,and will be used to the weather as well ,all my dogs are out back apart for one and i can see the differance in fitness in the dogs ,becouse the dogs out back are on there feet all day and not on there backs ,dogs are`nt ment to be inside , think about it a dog that lives out side will be uesd to the cold ,wind ect some house dog will look out the front door see the weather then try and get back in again,iv seen it many a time with the dog i keep in side ,dogs out back sleep in the snow ,they are hardened too the weather ,the