We can see it in dogs. All we have to do is look at how different some breeds are today compared to 100 years ago. We can literally see the traits that dog shows have chosen to be important to various species.
Not one dog ever became a cat. That is the difference between variation and speciation.
What the fuck does this have to do with evolution? The guy that started this thread was talking about how you can't see the changes in a human life; and my point was we can because of dog shows and the dogs that won. The breeders then went and bred those traits/characteristics that won the dog show. That's why so many breeds have health problems. This absolutely was not about dogs evolving into cats. It is about the dramatic change a breed has gone through because of dog shows and breeding programs. Look at the Bull Terrier today compared to 100 years ago.