Not sure what kind of proof you want. There is genetic variation from one generation of an organism to the next, some of which is due to mutations (i.e., something new). Scientists have found the gene that distinguishes small dogs from large breeds. The large ones have one form of the gene, the small ones have a different form that scientists think is a mutated form.
I at least gave you an example of mendle, who proved the genetic information existed prior...
He proved no such thing. He worked with existing genetic information, yes. But he didn't prove that all genetic information was pre-existing.
You assert that there's no new genetic information. So you should be able to find an example of a dog, or wolf, that has both the large-breed gene and the small-breed gene, just waiting to be expressed. I'll wait.
If We started off with a dog that had the DNA code to give say; black, brown, red, white, or other colors. After we kept picking the brown ones, won’t we eventually had dogs that had lost the code for black, white, red, or any other color? We did not get more DNA code or information. We actually LOST information. Do not Evolutionists claim that all the different breeds of dogs are evidence that dogs can evolve and gain new DNA code?
But In fact, the different breeds of dogs prove just the opposite, since new DNA information is never added.
In truth, the different varieties of dogs prove to us that In nature, the Law of Biogenesis says that all animals come from other animals of their own kind.
They have not been giving birth to something other than a dog or cat.
K.Butte
There is genetic variation from one generation of an organism to the next, some of which is due to mutations (i.e., something new).
Get some classic science background.