However with the first one, the command is quite clear – keep your dog on the lead, the second is not so and ‘fluffy’ other than saying you can bring your dog here. If you ask any dog owner, they will consider themselves behaving responsibly, as it is so subjective.

Without being overly pedantic, if you want dogs on leads (or at least the best chance of it) you have to use instructional language. It could however, have been written in a less patronising manner.

On my site I copyright all of my articles, but give permission or reproduce providing they credit the source. You say that this is your ‘attitude’ but the words do not say this – so how will people know?

The one thing I have learn on twitter and other places is to copy and support other peoples materials and they will (usually) do the same – promote your work.
Mike