Is it normal to be 21 and still snuggle with a stuffed animal?

As long as the stuffed animal is not interferring in ur day to day life, i don't see a problem. The dog means a lot to u. U ociate it with feelings of comfort, because it soothed u in a uncomfortable time. U have a good handle on the situation because u don't have to have it when u have human companionship. U understand the fact that its merely an object. Ur just fine. :)