My cats will also try to eat dog food...lol
I recently took my cats off of dry food and switched them to raw...My cat Max is having a hard time with the transition and is badly wanting dry. He eats plenty of the raw food and still is allowed to have canned food...but he WANTS that dry...lol I've caught him numerous times trying to climb inside the dog food bag so he can stuff his face...Both cats come running when they hear me filling the dog bowls...I have to fight them off with a stick practically.

However, they seem to prefer Eddie's Chicken Soup brand over Uallis's TOTW...lol
Also, my cats LOVE the Cosequin tabs that my dogs get. When I give them the tabs I just throw them in with their kibble and the dogs will just eat them like that...I've thrown the tabs into the bowls, turned my back for a minute and when I return the pills are gone...I KNOW the cats are stealing them when I walk away...lol