We own a Springer Spaniel who is really a mess! She is elderly and doesn't stand still for grooming and it shows. What would be the best way to get her cleaned up. She won't stand still for us to even brush her for more than about 5 minutes, same with a bath. She was abused before we got her and I suspect that has something to do with it. She is arthritic so we want to be gentle. She is in such bad shape we would be too embarrassed to take her to a vet. I don't relish this job but it must be done and I don't care to be bitten over it either. She is a sweet dog but I'm sure she would bite if we got serious about grooming her. Thanks.