These bowls work extremely well for dogs that are part Hoover vacuum cleaner. My dogs eat so rapidly from a normal bowl that they choke. Having to eat around the nobs in the bowl slows them down and keeps them from inhaling the kibble. I also add water to the kibble just before I put the bowls on the floor so that the food slides down their throats more easly, since they eat the kibble whole instead of chewing it.