I have finally finished my rig! there are a few little weight painting issues still left to paint out but very minor and can be down very quickly tomorrow before i move onto texturing and furring! I have completed my rig with squash and stretch, some nice deformers for simulating muscle jiggle in the hind legs, good paw roll (i.e. footroll in biped characters), the global control is working well with scaling, translating and rotating which is always a bonus. overall i am extremely pleased with my rig. I have just created a quick playblast that demonstrates some of the features of the rig, there are lots of little features not shown that is very useful for animation such as toe wriggle, neck bending, twisting of the spine and neck, jiggle on the muscles on the chest and lots more!
playblast of my rig doing some basic actions: https://youtu.be/96MzY1YlTuQ
images of rig and mesh: http://i.imgur.com/qXBi2eO.jpg , http://i.imgur.com/fx6R9Ol.jpg