Certainly, the history of playing a lot yesterday is very suspicious.
I don't think we can rule-out a possible soft tissue trauma or other injury that is contributing to what you are observing. Now, whether that is located in one of his extremitiies, body, or spine, we may never know.
So, fortunately, he doesn't appear to be ill or exhibiting bad pain in any other way.
But, to clearly not want to jump is a red flag.
Ideally, he will need to get in to a vet for a good evaluation.
If possible, try to also record him trying to get up, as that could provide the vet some clues. But, a good palpation of the body and range of motion of the joints to try and isolate the problem would be useful.
Plus, a vet could prescribe some good pain medication and/or a trial with a non-steroidal anti-inflammatory, which I think is your best course of action!
I will mention aspirin use below, but not a big fan. Nothing like what a vet could prescribe to get him back on track.
The only over-the-counter non-steroidal anti-inflammatory I recommend in dogs (NOT CATS) is aspirin. Due to potential toxicity issues if not dosed correctly, many veterinarians do not consider Tylenol, Ibuprofen (Advil), and Aleve safe.
You can give 10mg per pound of body weight up to every 12 hours. Just remember, there are different pill sizes for aspirin, so look to see if it is regular strength or maximum strength.
Aspirin can be upsetting to the stomach
, so discontinue if any digestive upset and definitely consult a vet if not helpful. If available, buffered aspirin, with the enteric coating, can help as well. Sometimes giving some Pepcid A.C. antacid 1 hour beforehand can be helpful.
Pepcid A.C. (famotidine
) comes in 10mg, 20mg, or 40mg tablets.
You can give it every 12 hours. You can give 0.5mg per pound of body weight. So, a 20 pound dog would get 10mg.
***Do not give aspirin or any other non-steroidal anti-inflammatory medication if your pet is already on prednisone or any other anti-inflammatory medication***
Severe stomach and intestinal ulcers can result from giving a pet aspirin, tylenol or ibuprofen when they are also on medications like Rimadyl
, Prednisone, Metecam, Zubrin, and Previcox
If he has any pre-existing liver or kidney disease, give him nothing and make sure to get him scheduled for a vet exam. Good Luck!