Master told it that it needed to prove itself before it would be allowed anywhere near His Superior Boots. if it could keep all the floors in His house clean with its tongue for a month, He would consider allowing it to lick the soles.
Well trained slave…even after 24 hours secured in total isolation it knows instantly how to respond to the kick in the head.
Next time it might be rewarded with some nutritious slop to feed on from the boot