It's true -- there's too much fat and protein in cat food for dogs. It would be best if you can put the cat food high enough that the dog can't get it. The occasional snarf won't hurt the dog, but a regular diet would make the dog fat and could affect the kidneys over the long-term. You could also teach the dog the command, "leave it" and maybe get him/her to leave the food alone, but up out of the way would be the safest choice, 'cause it smells sooooo good to them. I do, however, use cat treats for doggie training treats (in moderation, of course).