Why

I was on Youtube and I noticed a few new videos about the character reveal for the upcoming move all of them, including Dr. Wolf were surprised that there is anthropomorphic cat, seeing as the vast majority of sapient races in the show are quadrupeds. The superanina even seemed shocked seeing as Rarity has a pet cat. Here's my question. WHY DOES EVERYONE FORGET ABOUT THE DIAMOND DOGS MINOTAURS?! Oh, or that even with the diamond dogs in existence that Applejack has Winona as a pet.