I have one Dobe, 2 Vizslak and one monster dog - sorry little crossbreed. The little one belonged to my late aunt and I took him on when she died. My big dogs are suffering from little dog syndrome.
Could a doggie not come with you to do the horses? We have 3 dogs and we very rarely take them out for a 'walk' they just hang around the yard, run behind the land rover, take themselevs off around the farm etc. We have a yorkie, a black lab and a delinquent foxhound.
You are missing the point! The dogs spend the time with you that you spend with the horses as they are there with you. If you see what I mean. Unless you are are on a livery yard that won't have dogs which many won't.
I have 2 dogs - a 3 year old Hungarian Vizsla called Josh and a 2 year old English Pointer called Daisy.
Here they are (looking a bit grubby as they've just been in the pond)
A Bordercollie male, Malamute x Husky male. Doberman girl, and two rescued Staffy cross puppies (male & female). I've always wanted lots of dogs, so this feels natural to me. I tend to get some weird looks being out and about with my lot though