Coming from a family that had both cats and dogs as pets at the same time, I find the combination perfectly normal.

Why shouldn’t two non-competing carnivores get along? When you look at nature, oftentimes animals of different types are found feeding or drinking water from the same source. It isn’t that unusual to find a cat and dog that have grown up together cuddling and sometimes grooming each other.

The most likely way to create this happy outcome is by raising the two together as companions from kitten/puppyhood.

Like many things in life, if you expect the best, then it’s likely that’s what you’ll get!