I have two cats - the old (2 years) and the small (about 7 months), so after the appearance of the small, the old periodically began to scratch not in the sand barrel, but opposite the barrel in the corner. I beat her, ticked her mouth - useless. Then I remembered the first courses of the universe of medicine, where I taught the conditional and unconditional reflexes, the experiences of Pavlov, etc. So, at the next act of defection of the old cat in the corner, I took the old and the young cat in both hands and ticked the mouth in the feces - I MALL. And, miraculously, after the third time, with all kinds of attempts of the old woman to guess in the corner, the young woman shouted at her, spit and beat her legs. The problem solved. I feel like a scientist, pleasant.