Actually we separate by play style. We have one yard that is mixed sizes but we test each of our dogs extensively with different size dogs and many times the bigger dogs in the mixed size yard are house mates with one of the smaller dogs in the same yard. We have another yard that is strictly extreme players that are all larger dogs who run and play hard. We rarely have incidents even minor ones, but when we do it almost always in the active players yard and not in the mixed size yard. All dogs are well vetted and supervised so even if there is an incident, it is quickly resolved without consequence.
Yes they do.
Thanks! Your answer is awaiting moderation.