Cool idea! I was a huge fan of your Pocket Change game for the PP Community Jam, and it's neat to see you take on a different genre. I also appreciate that you created two wildly different modes with the same basic system.
There was a pretty good number of good-looking sprites and animations here!
The explanation that the man is so weak that HE WILL DIE if he makes contact with anything made me chuckle when I read it, and then again when I died by walking into a wall.
The hitboxes were a little unforgiving, so this was a little difficult to play. It would help if there was an "aim" line that showed the path the man would follow if you barked. And I would be more excited to play a version of this where the dog and man both move faster, and you have to evade enemies that chase and corner you.
Nice work, and very impressive for a 13-year-old!