husky acting funny after losing our other dog

(i wasn’t sure what to tag this as, so forgive me if the one i chose was incorrect) one of our dogs unexpectedly passed away six days ago, and up until today, my husky had been acting fine. but, as i’ve gotten home today, he hasn’t met me at the door (which he has always done) and he’ll just stay laying on the couch (which he never does). we lost our other dog to health complications, so i’m probably just being paranoid with husky’s behavior. he’s been eating and drinking and acting otherwise pretty normal, but im just so terrified something is wrong. could it be that he is grieving? they were pretty close and always played together, but he’d been acting fine for abt five days after her death, so i’m confused as to why this would be happening now. any advice is greatly appreciated <3