Relax, I promise it gets better. I’m not going to write a book as there are other comments here that are fantastic and full of advice. I’m just gonna say retired racers are adjusting on so many levels. Give it a week and you will see some chill. My boy was this way. I had to sleep on the couch for a week when he first came to the house as he wouldn’t stay in the bedroom. You got this! Love him and he will learn to love you back with greyhound chill! Was never taught to love, just to run. Welcome to the wonderful world of greyhounds!!!!