The first goal can simply be:
Door moves.
Finn gets somewhere safe.
Finn does not panic.
Finn recovers.
Eventually, the amount of retreat he needs may decrease.
The Most Important Change May Happen Afterward
Right now, Finn can remain hidden long after the door stops moving.
Future progress might look different.
The latch moves.
Finn retreats.
The door closes.
Thirty seconds pass.
His nose appears.
Then his head.
Finn steps out.
He approaches his bed.
Turns.
Lies down.
That would mean he can recognize that the frightening event has ended.
His fear would have a beginning and an end instead of taking over the rest of the hour.
Someday, the Bed May Stay a Bed
That is the ordinary outcome everyone is working toward.
Finn sleeps.
The kennel door moves.
His head rises.
He watches.
Maybe he steps backward.
Then nothing else happens.
No teeth close around the mattress.
No frantic pulling.
No desperate attempt to wedge his body behind it.
Finn remains visible.
Eventually, his head lowers again.
The mattress never leaves its place.
For Now, Finn Still Builds His Own Wall
The kennel is quiet.
Finn is stretched across his bed.
A hand touches the latch outside.
The metal door shifts.
Barely an inch.
Finn is awake instantly.
His eyes lock onto the entrance.
He jumps down.
His teeth grab the mattress.
He pulls.
The bed slides.
Finn releases it, grabs another edge and pulls harder.
Across the concrete.
Farther from the gate.
All the way toward the back corner.
Then he squeezes into the narrow space behind it.
His belly lowers.
His body presses against the wall.
Only his eyes and the tip of his nose remain visible around the mattress.
The kennel door has already stopped moving.
Nobody has entered.
Finn stays hidden.
The bed that gave him somewhere comfortable to sleep moments earlier has become the only object he knows how to place between himself and the thing that frightens him.
And until Finn learns that the sound of a moving door no longer means he has to protect himself, he may keep dragging his own bed across the kennel just to build a wall where none exists.