I have a 2 year old Aussie named Puzzle who we just acquired a month ago. The issue we have is our village does not allow fences. The breeder we secured him from had a large fenced in area for all her Aussies, and since we got Puzzle we've tried everything short of an electric fence to keep him in the yard. Flags, bright yellow rope lines, bottles with small pebbles tossed on the ground if he should go near the line, etc.
Any ideas would be seriously considered.