I jus got off the phone with the vet, and she says he is just fine.
She did several x-rays and found no broken bones. She made sure that he was ok internally. He doesn't seem to have any pain at all. His color is good so she doesn't think he is bleeding internally or anything like that. She said that he is playing with her dog right now having a ball, and acting like he is king of the castle. Our vet just loves Marcus to death! We changed vets after we brought Marcus home (since he got so sick), and I've never been happier. She is awesome! She truly seems to care for him as if he were her own. Thank you all so much for the prayers. I truly believe in the power of prayers and how they help heal. It's also nice to be in the situation that I am where I can be on YT even at work.
Thank you all again for your prayers and support.