Protect one's own interests

Yesterday somebody drove over the yellow/orange neoprene football with 2.5 tons of Jeep. Today we are making sure this doesn't happen again.
If you are ever thinking of getting a border collie pup, don't ever, ever give it a ball or frisbee or you will end up with a Ball/Frisbee Junkie. Flash is incurable. He regularly has 4 fully intact tennis balls in his mouth. He's also a wonderful goalie but punctures all plastic footballs within a minute. The leather one's last with luck a month or two, at least in winter.