Hello Everyone,
So it turns out Gibson was neither constipated or dehydrated. The vet thinks he may have a injury to his back or a pulled or strained muscle. He said that he probably wasn't drinking fluids because he wasn't feeling well. They gave him two injections, an antibiotic and one for pain. He's going to be on Metacam an anti-inflammatory and pain medication for 10 days, then needs to go back in for a check up at that time. I also have to keep him confined for 14 days so he doesn't aggravate his injury further. I'm hoping it turns out to be a pulled muscle and nothing more. After he got back home, he was being his normal self again, probably because of his injections. Thank you all for you help and warm wishes, it really helped ease my nerves.
P.S Ellie May, I was on edge today being that Gibson was sick and took your response wrong. I understand what you meant, and apologize for jumping to conclusions.