Regarding Mr. D, maybe look between the pads of his paw. This happens to Grampie sometimes actually heís limping now. If you kinda look around or feel deep next to or between the pads,
There may be a sore. I just found a little sore on Grampie.
I put just a little Vaseline on the sore to heal and smooth it.
Or you can use neosporin, but I worry if they lick it.
I hope you both feel better soon.