I love this game! It's so cute, so original and very fun! I love how hard it is to reign in my pet dino. In my first play-through, I forgot about L-Ctrl (even though I did read the instructions) and tried countering the dino by moving in the opposite direction. Even though I wasn't playing it right, it was still a lot of fun! In my second play-through, this mistake helped me to see the beauty of the Run mechanic; it allows you to successfully counter the dino, but it also means risking that you run into a more populated area, which instills this game with a back-and-forth style of tactics. Do I sprint away so that Dino doesn't eat that dog, or will I just run into a larger group of humans and dogs? Brilliant.
Perhaps this could open up a means for scoring; so at the end of the level, we see our total casualties as well as a breakdown of the number of dogs versus the number of humans. This would support the decision-making aspect mentioned before. You could also add environmental hazards to increase difficulty. Ooh, and maybe the player can find new leashes; short ones might make it easier to prevent the dino from snacking on a bystander, but would also pull the player into the range of environmental hazards, while longer ones might make it easier to avoid hazards, but harder to control the dino. I'm no designer, just a player, so take these with a grain of salt - I just liked the game so much, I can't stop imagining how you could scale it up for a larger release.
Anyways, great work! I've probably ranked a couple dozen games so far, but this is only the third game to which I've given a perfect score. You earned it. I hope to see a full version one day.