It never gets easier, had a German Shepard do about the same thing, got home and she didn't come to greet me. Found her in her hiding hole, Under a stair storage area in the garage. She moved over a bit and licked my hand. Went to get the wife and told her Sasha was going down, when the wife went to look she had passed. She waited until we came home bless her. Wife and I cried like a baby. So sorry for your loss.
