My WGSL/Czech WL mix killed on of my cats last spring, when he was about 3.5 years old. Although he had chased the cats before in play, I don't know what happened this time as we were obviously not home. Did my skittish little female cat just not run fast enough?
He was a dog that had had lifelong fear aggression and human aggression issues. But he had been raised since a puppy with my household animals and had NEVER shown aggression towards them before this. Did his other issues play in? Could of, definitely. Or could of been the fact that he was a high prey drive dog.
People obviously have dogs on here with cats that do just fine. Me personally, I've sadly lost trust in ALL dogs being left alone with cats. Simply because I like to think I know my dogs pretty well, and animal aggression to this extent was something I never saw in EITHER of them until that day. After that day, all his aggression issues got worse, he destroyed my rat cage trying to kill them (luckily they hid under a bookshelf), and he went after my other cat twice in one week.
I am getting a WL pup here in 2 weeks. He will be crated. When he gets older, he will either still be crated, or locked away in a separate room from my cat whenever left alone. When we had a husky in the past, a breed KNOWN for high prey drive, he was always crated and never trusted alone with the animals.
They can coexist just fine. But you as the owner sometimes just need to make sure accidents can't happen. BTW, Luther was really unable to be crated, as he had stress colitis and would have diarrhea in his crate, and then would sit in it and develop severe hot spots. Overall, he was sadly just a genetic mess. Maybe not the best example for this case, but that's simply my story about dogs and cats.