Im frigen Happy that my comments/dogs came in the video :D (Edit : oh btw the round head guy is called a "Beta Dog" When wobbledogs was in beta still thats how the dogs looked like!)
If your dogs look way to normal, breed them with the dog you get for beating the tutorial, I did, and I immediately got two heads on my main file, and six legs on another file.
You actually can evolve wobbledogs by feeding them or something,it’s happens rarely,One time my 2 headed dog named “Donut” lost a head,what a coincidence because another 2 headed dog gained a head!
I really hope you backed up your save cause round face/beta dog I heard can mess up your save due to the game tries to turn the round face into a normal one or something