For a moment, his body is divided between two surfaces.
Then he takes another backward step.
His front paws finally reach the mattress.
Only when all four feet are on the bed does Biscuit stop.
Then He Lies Down Facing the Door
Almost every time.
His body may curl slightly.
His chin may eventually rest on the bedding.
But his face remains oriented toward the open part of the kennel.
He can see the gate.
He can see movement beyond it.
The wall stays behind him.
That Position May Give Him Information
For some dogs, being able to watch the environment can make resting easier.
That does not necessarily mean Biscuit expects danger.
It may simply be the position in which he feels most comfortable.
After an overcrowded living situation, having control over what is in front of him may be particularly useful.
But again, that is a plausible interpretation—not a fact Biscuit has confirmed.
The Shelter Does Not Force Him to Face the Wall
There is no reason to rotate Biscuit every time he lies down.
If backing onto the bed allows him to use it comfortably, the behavior itself does not need immediate correction.
The more important question is whether it is safe.
With weak hind legs, repeatedly stepping backward onto a raised or unstable surface could increase the chance of slipping.
So the environment can be modified before Biscuit is asked to change.
The Bed Is Made Easier to Enter
A low, firm sleeping surface can reduce the height difference between the floor and mattress.
Non-slip material around the bed can give Biscuit's paws better purchase.
The mattress should not slide away when his rear foot presses against its edge.
Those changes do not address the reason Biscuit backs up.
They simply make his chosen strategy safer.
Something Changes When the Bed Is Moved
The mattress is repositioned slightly.
Instead of being pushed deeply into the rear corner, it sits with more open space around it.
Biscuit approaches.
He slows.
For a moment, it looks like he will turn around as usual.
Then he takes one forward step onto the edge.
Stops.
Backs off.
The next time, he returns to his normal routine.
Turn.
Reverse.
Lie down.
But that single forward paw provides another clue.
Perhaps the Mattress Isn't the Entire Trigger
If Biscuit can touch the bed from a different orientation, the original location may be part of what matters.
The corner.
The wall.