My wife an I found a baby Eastern Gray squirrel in a park abandoned with a bloody nose and cut on its tail. It was way too far from any trees or the other squirrels. We tried to observe and see if there were any squirrels in the area, but none appeared. We took it home and began rehydration according to what I found on the net. We have performed rehydration (3cc of Pedialyte ever hour for 6 hours) followed by a diluted puppy formula for the rest of the day. We have done this for the last 6 days because he doesn't appear to be recovering. His back skin still tents for more than 3-4 seconds. It improves after each meal/hydration but an hour later he has urinated most out and is back to where he was before. He's very active when woken, his mouth is moist, gums pink. Another issue is he appears to be 4 weeks old but only 35g. I've been feeding 3cc's but according to the 5-7% rule that's too much.
Am I overthinking this or should I give up and take him to an animal clinic/rescue?