Explosive dogs?

I found this on a website that was looking for funny signs in the UK. The above example is very similar to the hedgehog question in our tutorial.

1)The first interpretation would be the notion that very volatile search dogs are at work. (My, I think that's kind of macabre)
NP: Search dogs
Premodifier: Explosive

2)The second interpretation would be that the search dogs are working on something explosive.In that case, I think they ought to include an exclamation mark after 'explosive', so that people will not think that it's a premodifier of the NP "search dogs".