The problems with bob

def:

"A Bob is a thing that can feel no pain" - Stefán Elías 2009

Actually Einar (Stefáns bestest friend) and Stefán both have Bobs they bring with them everywhere.
Some people might call them imaginary friends, because you can talk to Bob, he is funny. He even gets hungry.
Bob's tend to look like a regular backpack. If you look inside you will see Bob's guts, including his heart (the pencil case).
Bob likes to fall down stairs, be kicked and talk with other Bobs.
Recent problems we have had with Stefáns Bob include:

• His refusal to use the new backpack we bought him at Christmas after we made it rather clear that it was not a Bob. 
• Bob has also developed a dog allergy making him sneeze when he sees Rósa, our dog.
• Stefán and Einar decided to give the Bobs a shave today and used, what appears to be, an entire can of shaving foam.

I wonder how much longer this will go one for, or if I should do anything about it.
So far, I have basically let Bob be, but I know it is driving my husband crazy.