Our little visitor

We spotted this cute little guy in our garden this morning, eating my grass seed I've just put down!!

Anybody have any idea what he is? He is a bit bigger than the size of an adult fist.

We have recently blocked off the garden as the dogs have been obsessed with something and have been digging, possibly to get this guy. We have also had something burrow under the lawn and leave mounds. I thought we had gophers in the garden, but don't think this is a gopher. We have gopher sticks installed in a few places in the lawn, but this little guy doesn't seen bothered by them, although i guess the sound they omit is more underground than above.