Humans have brain farts all the time. Our brains kick into auto-drive and things just come out our mouths or we start walking into glass doors and disaster just happens all around us. After realising their brain fart, humans generally look mortified and quickly attempt to correct themselves, running through the moment in their heads 100 times.
So, if their humans are allowed to have brain farts, why can't dogs? After all, we have shame, dogs have no shame.
The difference is that dogs just own it. They don’t care if they are sitting in the most unladylike way and, if they run into the glass door, they will just own it! As long as their humans are happy, they don’t care!