Decorated combat dog shot by civilian

[Catherine]

This is a sad story. Mike the bomb sniffing dog survived tours of duty in Iraq. Back home he is a PTSD service dog for his handler.
Someone on a bicycle claimed the dog attacked him He shot the dog with the gun mounted on his bike.
After all Mike had been through and all his handler had been through it seems so unfair that he could be killed like that.

http://news.google.ca/news/url?sr=1&ct2=...t=2&at=dt0

The dog was safer in Iraq. I hate to ask the question, but is it safe to have a gun mounted on a bicycle. Is it really legal? I guess it is, but is it a sensible thing to do.