Can Dogs Read?

I wonder what it means

[Jan]

At least it adds some humour to the sign! Well spotted.

[crewnelson]

Haha. It means 'make sure your servant picks up after you'!

[Margaret Snell]

@jan11 Yes written by someone with a sense of humour

[Margaret Snell]

@crewnelson Thank you, I did wonder if that might be what it meant