Hello DogCatmom. I suggest trying to spray the MMS solution on the sore spots, regularly, apart from giving the remedy internally, or when there's no chance to apply it internally. My male cat had a fight with his rival that left him with a large wound inside his right thigh, last Thursday night. The vet told me that this wound should close up in time by itself, no need to operate. Apart from giving MMS orally, I also spray the wound with it, when my cat isn't aware of me trying this.
I can easily surprise him from behind, and although he jumps away, which makes me laugh, at least his wound received treatment. He's also on antibiotics (for 5 days only). Not my favorite remedy, but the vet gave it to me, recommending it. I decided to not mention MMS, at risk of being ridiculed and not receiving proper service. 5 days of antibiotics aren't too bad. And cat claws can be nasty, isn't it? The wound doesn't bleed anymore after 7 hours, and in the morning it looked clean, also because my cat keeps himself very clean, licking his wound properly, I've noticed. He's in good condition, eating with ardor and sleeping a lot.
I hope you'll find a good solution with your dog.