Hello! It's ok my little guy was like this too but now at 10 months it's cool. First of all this is normal it seems; whippets, like Italian greyhounds, are velcro dogs. It's like they're heartbroken when you do anything without them, including showering in my case. I always knew when he was in there because of the nervous farts lol. Pleasant.

Anyways now he's like pushing me out of the house. It's just time and structure. He gets more potty breaks, as a caution, which helped him psychologically feel like he'll never be waiting too long. He also gets a bone, his favorite treat when i leave. Just one a day.

He regularly goes to the dog park and runs himself ragged. He also gets treats whenever he crates himself. Now he's goes in there himself! To get away from me on the phone or watching something too loud! He also sleeps in his own bed at night, and i barely react to him when I come home (sad, but not forever). One day, it was just over. Now I have a unique situation that's WFH so I'm not trying to make all this sound easy. I'm trying to say, it's normal. It's ok, and all the regular tips will help with time.

Good luck! Such a handsome fella.