I have triangle shaped bowls that can be secured in the corner but I quit using them when Sammy climbed up on the bowl and chewed through the part where it attaches. He just doesn't like to eat pellets out of a bowl. I'm confused as to why because he has no problem with eating his veggies out of the flat pan I use. The solution is to put half in the bowl for Dean and the other half on the fleece for Sammy. It doesn't completely stop their argument, but it cut it down considerably.