Poor Eating, Different Behavior: Result from Attack?

I have a 13-year old dog (12 pounds). Seven years ago he was attacked by a neighbor's dog on our property, which caused severe lacerations around the rib cage. Even though it was a horrible experience for him, he didn't lose his appetite, but it did take awhile for him to want to go out for walks and such. In a couple of months, our dog was back to "normal" (or, a new normal), and he was a happy-go-lucky pooch, still full of energy. Now, seven years later (and doggy cataracts to boot), he was attacked again 10 days ago (he was high on adrenaline and fully functional after the attack) that warranted an emergency visit to the vet hospital--one laceration caused a pool of blood that eventually clotted 30 minutes after the attack. We couldn't afford x-rays, bloodwork, and an overnight stay, so we asked the doc to do what she could so we could bring him home that night.

After stapling all of his injuries and being sent home with drugs (Gabapentin, Clavamox. Metacam, and Entyce), he hasn't been the same. Day one after the injuries: gave him the usual drugs, fed him an hour later--which he scarfed without prejudice, with the exception that he refused to eat his usual high-protein dry food--couldn't get him to touch it. So we went the soft route. Thanks to the drugs, he was sleeping a lot, drinking a lot, and was a slugbug. We also noticed the extent of his injuries, externally: over 20 staples and a lot of red, black, blue, and purple swelling/bruising around all of the staples, under his chest, ribs, scrotum, belly, tail, he lost a tooth, ugh. You couldn't pick him up without a yipe or receiving a severe bite, so we figured he just needed to get his rest while going through the new routine. On day two, the anesthesia wore off, he pushed himself up, went to the back door and did bark (sound like he was struggling); he didn't have any problems urinating or passing poo, even on day three. Unfortunately, there were times (and still are) we didn't notice that he needed to go because he hasn't barked since that day, so this was #1 of the behavioral change we noticed. We never had to use pee pads. Well, now we did!

Day four and five, we would get up a couple of times in the middle of the night and slowly coax him out the door to do his business. During the day, I would take him out in the morning, afternoon, and evening. His water intake is faster than our attention to him needing to go pee! On the fifth day he was struggling to poo, so we started giving him a tablespoon of pumpkin. He was still sluggish, slept a lot, saggy ears, absolutely no motivation.

By day six, we noticed he wasn't interested in eating, but he still drank a lot of water because of the drugs, and was still constipated--never seen him struggle so much. Gave him another tablespoon of pumpkin. This time I decided to get a little creative with the soft food, since he didn't show much interest in eating--I made some smoked roast beef for dinner one night and took a tablespoon of it and mixed it in his softy. WOW! Did he gobble that up! I'm not one to give him table scraps (he's lived this long without it), but it got him interested in eating (yes, I'm still giving him all of his meds, as much as he despised it). So I added one tablespoon more of the meat and mixed it in with MORE soft food. Gobbled it up!

By day eight he finally passed some poo, still drinking and peeing like a camel but still struggling to voluntarily eat and move. He really is not the same dog, even when I have to force him to go out and walk for a bit (he needs movement by now to pump the blood, rebuild muscle, loosen the joints). So every day I would force him to "walk" a little longer. He still has is tail between his legs, ears and eyes/head sagging, slow, crippled movements, and it's just sad to see him like this.

Since this attack, he isn't the happy little guy and just sludges around. He doesn't bark anymore. He only wines when he makes his bed to sleep in, but not much else.

With the meds now on their last leg and concerned about his lack of caloric intake, I decided to try Tomlyn Nutri-Cal, High-Calorie Gel for Adult Dogs, thanks to the recommendation of my vet-tech daughter--still waiting for the product to come in. I've read a lot of great reviews on a variety of websites and am hoping that this'll help with a good smear on his food, as I don't want to continue the roast treatment. She also brought home some beef and liver chews, which he does gulp up, when dressed in the roast. She also recommended raw foods that are available at pet stores for more high-calories, protein/fat intake that would help, since he won't eat dry food anymore.

I guess I could use some recommendations from anyone who has been in a similar situation. He's scared to death to be too far away from us and walks very slow and crippled, even though he walked into our house high on adrenaline that fateful night and nothing seems broken. Maybe he's still in recovery from the tussle?

I appreciate your reading and look forward to your feedback. Thank you,