Walk the dog lures are slightly tail heavy, with the center of gravity just past the center point of the lure. The bigger ones sit almost horizontal, with 1/3 of the head section out of the water. At least, that's how I weight my 6-8" walking baits. And my Pupfish knockoffs, which are 8-10" (which is, I think, Musy size) are weighted the same.
The smaller the walking bait, the deeper the tail can sit in the water, since there is less lure inertia to overcome to get a small lure up and walking. A smaller lure that sits in the more horizontal attitude will glide like a punker or a Pupfish, as well as walking like a spook or sammie. But it won't be as easy to walk.
Having the center of gravity past the center of the lure toward the tail helps the back of the lure want to keep moving on the pause more than the front, which gets the lure turning sideways. Then each successive stroke move the head forward and swings the tail around to the other side.
I float test my walking lures in a bucket of water, and look for the tail down as an indicater of proper ballasting. If the lure floats that way, and I've shaped it properly, I know it will walk without test driving it on the lake, and I can go on and paint and finish it.