there you go ,
inadvertently brought up a very good point .
your dogs loosen up by pressuring there limbs
this could be called stretching
so not to be confused
loosening up is different from the real stretching people are put thru ,
i dont think your dogs
xross ing the legs the pushing down with front paws to create a figure 4 then place pressure on it with a balistic stretch.
or putting front paw over head then with other one pull it across their body
right there dead keen or his dogs have nailed it .
loosen up with in their range of motion
then out the door .
same with horses ,
i did alway pick the fronnt legs up and give them a shake to loosen and relax before i put the saddles on em
back legs to on some
only some as they could use you as their ballistic stretch if hey were not in the mood for stretching