Exactly what I said. Our rules do not allow for boarding at two different barns. Breeding, training, etc are special circumstances and typically short term.
And seriously - if you have horses at multiple barns - what kind of quality time are you spending with them?
How do you even enforce that? Like, how would you ever know if someone had another horse elsewhere? Just curious. [=
Honestly, I don't think how much quality time I spend with my horse is the BO's business. Neither is where I keep my other horses.
And the germs reason is BS. You can pick up germs ANYWHERE - a tack store, a horse show, the mall, school, work - and transfer them to the horses. Do you require people to become sterlized before walking into your barn? All your vets and farriers that come from different barns all the time, they aren't carrying germs?