I second this. One of our dogs did get their legs caught in the opening. It was terrible. We are now getting plates welded on top.I hope you get yours early and they get right on it. I want SOS sliders.
The only changes I will make from the ones I have now are to get the plates welded on the top like yours. I really didn't think about it when I got mine, but the sliders with the openings are dangerous to my dogs. I'm paranoid that one will get their leg caught in it jumping in or out.