Released!

Prying the butter knife’s edge under the ring pull, he levered it up far enough to get his finger through. Then, hooking his finger in the loop and pushing down with his thumb, and with a loud tok, spraak,  the lid was off.
Holding the tin in his left arm, he ran the butter knife along the inside edge of the food to loosen the vacuum and then tossed the knife in the sink. Walking to his basement door he typed the six digit security code that released the door and propping it open went down the stairs.
Looking right as he neared the bottom, he gazed across the open area to her cage against the far wall. Heavy and reinforced within the substructure of the house, the cage took up one half of the basement floor plan. Clear six inch thick glass covered all but the left quarter of the cage front, where a door and a small  food depository bay were built in.
Inside the cage, she moved up to the glass, placing her claws against it and fogging the section by her face. Her emerald eyes shone with recognition and also, he saw, with hunger. He held up the tin to the glass, and she licked her lips and began to show all the signs of excitement that proceeded feeding.
Pressing a small green button on the console by the door, he stepped into a small anteroom chamber designed to allow him to pass through without fear of her bolting past him. He poured the food into the small food bay to his right and pressed another button the bay slid out into the cage and then right, across the bottom toward her watering system.
As he watched her devour the food, he noticed a small blinking light in the opposite corner. Pushing another button, the door behind him whooshed shut and the one in front slid open. She glanced up at him, but kept eating. He strode across to the small blinking light, wondering what it could be this time.
Filter changing time, he thought. As he focused on the small environmental console, he heard a deep growl directly behind him.
He turned as slowly as he dared. There she was, standing at full height over him, her glowing green eyes looking down at him with what he believed was fierce sentience. Her growl was deep, her breath rank. Sweating and shaking, he tried a few words, but she roared over his pitiful attempt. She backed away, slowly toward the inner door and pushed the exit code with her talon.  His eyes widened. She’s been learning!
Locking him in the cage he watched as she crawled up the stairs and heard the muffled thud of the basement door shutting.
Oh God,  he thought. She’s gotten out!