Just found this warning on a breed rescue site

A product is being sold in garden centres and shops called COCOA MULCH this is a substitue for other mulch's or soil improvers that can be deadly to all dogs.  If you are a gardener and have a dog please do not use this product, better safe than sorry.  As far as we know there is no warning on the product bags  The lethal ingredient of COCOA MULCH is called THEOBROMINE.  The mulch smells like chocolate and is attractive to dogs, if they eat it they have very little chance of surviving.

Blimy thanks I read Nigel Slater who used on his Hostas ect and I was thinking of some for next year. Quick thinking Bodhi!!!

I heard about this a couple of years ago and always steer clear, normal mulch is fine.