That's a hypothesis, certainly. The next thing you do is start trying to confirm that hypothesis. As I said above, find the dog with both forms of the size gene.
They have not been giving birth to something other than a dog or cat.
This is, really, a meaningless statement. First of all, nobody ever claimed that an organism would give birth to something that was of a different species. (That would go a long way toward disproving evolution, in fact.) Second, what's a "dog"? How much would something have to change before you weren't willing to call it a dog anymore? Remember that it would be changing into something new, not something you're already familiar with.
You mean besides "standard theory" as defined by evolutionary scientists?
okay, smarty put up or shut up, where is your example of a species changing into another?? living or in fossil record.
(the horse has been debunked already)
"As I said above, find the dog with both forms of the size gene...."
as far as I know no one has mapped the genome of the dog. so you are knowingly asking for the impossible to prove a point. But it proves nothing..