maybe some form of temporary fence.
Agreed. Some time ago I installed a temporary fence to try to help some grass grow near my house where Pimg runs a lot (I've since given up on all hope of grass). The fence was just cheap landscaping fence that I installed with long stakes. It worked just fine- but admittedly Pimg is amazingly respectful of boundaries.
Not the best pic, but it's all I have on hand. You can see the fence and stakes:
C-ATCH Pimg - DOB: 2/06, RATO, UJJ (x2), DJA, HIT, CA, CGC, High in Games, Reserve High in Standard- CPE Nationals 2014
RATCHX High Jinks vom Neuanfang - DOB 9/12 (Gotchya Day: 1/23/2013) CA, agility superstar in training