Your farm is beautiful, the layout is wonderful. Your horses are well cared for, and they are lucky.
I had dreams last night about how beautifully laid out your farm is. I am in the planning stage of building a farm so when I see one I like the layout, its great and gets my mind working.
Do you like the shed row, any negatives with that?
As far as your op, I can understand your desire to protect M, and I also found it interesting to read about ‘hunting’ not something we have up here where I live nearby. There is a lot of language and things I did not know.
We do have hunter paces, and I wondered if that might be a good compromise.
I think it must be great to have a horse who so loves his old job.
When I was younger, I rode a grand prix horse who was semi retired. The barn was sponsoring a show, and the poor guy went nuts in his stall, so wanting to go out and do his thing. Alas, his days were over, but I saw how it got him going, similar to your M with the hound.
Any animal would be in heaven at your place, so I say go for an older retired hound.
Again, beautiful place and horses.