oh, I hear ya - loud and clear! Merlin recently ripped a toe nail out, and was not able to go for a good run for over two weeks. Yikes! I did walk him gently around the neighborhood, and I tried to play with him more than usual and do some training, both of which really stimulate dogs' brains and tire them out. It really helps. Exercise is not the only form of stimulation that can ensure your hound is tuckered out at the end of the day! Also, anything that is a change from his routine will demand mental energy.
When I took Merlin to the ballpark again (boy, was he happy to run again!), I was a delinquent mum and forgot to walk him BEFOREHAND to get him a little warmed up - I only walked him afterwards - and he pulled a muscle. Two days later, he's already on the mend, but just thought I'd mention it here!
Glad to hear Sol is doing so much better!