If speciation exists, each observable species will have a known and observable very similar but different species. The trajectory of speciation dictates this.
But it simply is not found. Not just for dogs, cats, horses, tapirs or platypus. It is not found for any species. Completely obliterates any possibility evolution is true.
It is totally found. Have you never bothered to look at the biological tree of life?
Oh wait, I already know your answer, you remain unconvinced. Meanwhile, out here in reality, where the facts live, speciation is real, and exactly that evidence exists.