I have struggled to find a way to groom Rodders that works for us and I may have found it. We have just been sat on the conservatory floor and he has been happy for me to use the slicker on him just as long as he could chew the puppy brush. When I got close to places he wasn't happy with he would turn around to bite the slicker but I could divert him by tapping the puppy brush on the floor. Trouble is, it means I can't really do his tummy.
He has been back to eat more of his breakfast so he has had almost 3/4 of it and I am about to lift it.
He has asked to go in the garden again and has pooped and is now sniffing around quite happily.