No he wasn't sick at all. A perfectly healthy 7yo labrador, and was jumping around like crazy as usual when DH fed him in the morning. We have no idea what happened, he looked like he was sleeping up against the house in the sun :( We just hope it was peaceful for him. The kids are sad but I don't think they really understand he's not coming back yet.
I haven't heard about the 22 days just that you normally see a heart beat at 6 wks. How many weeks are you now?