Avril is OBSESSED with tennis balls. As I am typing this she is begging me to throw it. A little info: She is a maniac. A ton of energy, I think more then most border collies. She's LOVES to run. She would honestly chase after a tennis ball until she couldn't anymore. When I take her to the park, she will be panting super duper heavy but will refuse to leave because she wants to keep playing, it's impossible to get her to stop, and if she knows we have a ball she won't drink water, won't take treats. She goes into a world where she is totally focused on the ball. I know that sounds weird but that is honestly what it is like lol. In the house, she will constantly bring me a ball, I will take it away and hide it. She goes and gets another, and another. And will pester me. If I take away all of the balls she just paces away back and forth around where they are hidden. How do I get her to stop being obsessed? I don't want her to never play with one again, but I don't want her only thinking about tennis balls all day long.