Drinking bowl for a naughty rabbit

Rabbit Lamb loves to turn everything around ... I went over several options for bowls for him, but it's all useless. This is his feature, not all rabbits', because rabbit Hippie does not do so. One of the last options is a heavy cave-shaped bowl. This option is so far the best. The bowl is heavy enough to turn over. In addition, its form does not allow Lamb to put in it ... his shit ... This is another of his habit. When I throw it all away and wash the bowl, he is very offended ...