has this dog secretly been trained in the art of ninja?

This (terrible) photo (sorry) was taken of a sign on a convenience store window near my house.

Pepper spray on dog?!?

Perhaps the owners wanted to warn intruders in a big way, so decided to mention both the pepper spray and the dog, but then got all carried away and put them together.

I figure it must be this, or:
a. this dog has already been the victim of pepper spray him or herself, leading to what one can only assume is a reduced capacity to function as a guard dog (which then sort of defeats the purpose of the sign), or
b. this dog has been secretly trained in the art of ninja, a la Teenage Mutant Ninja Turtles. (Master Splinter has been busy, non?)

RainyBow