@matti You're right about you-calyptus. 😀 I like the 'gravity' concept. Don't take a fully fenced dog park for granted. We used to live in Wellington which had 40 dog parks, none fully fenced (until one was fenced not long before we left). I could never trust my dogs and in fact at one dog park I never visited again they ran away from me and onto a very busy road. We were extremely lucky an oncoming driver saw them and stopped.