First I would take her in for a check up. You know your dog better than anyone, and if you think there is something wrong, there is. However, it doesn't necessarily mean something terrible! Someone on GT (and I don't remember who ) described it as "random greyhound quirkiness" It could be something minor, that you didn't even notice. You may never know, but if the vet checks her out as OK, then try not to worry I don't know how old Ruby is, but I have noticed that all my animals have gotten more clingy as they have gotten older.