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Generally when a dog shows issues of having trouble with jumping up there is a disc problem in the spine. They will yelp sometimes if you just go near them, they will not want to jump on furniture or play.
I will send you a link that goes over this. If at any time the dog starts to drag its legs you need emergency care.
For now keep him crated and rested with going out for potty reasons only.
You can try to give a baby aspirin tonight and see with rest if that helps. Do make sure that the dog is not on any other anti inflammatory meds from your vet such as Rimadyl or prevocox. Do let your vet know if you have given aspirin. This should only be given twice a day 12 hours apart as it can cause ulcers.
Here is more on dosing. http://www.petplace.com/article/drug-library/library/over-the-counter/acetylsalicylic-acid-aspirin
lower spine http://www.petplace.com/dogs/intervertebral-disc-disease-thoracolumbar-area-in-dogs/page1.aspx
I would also move the dogs food into a crate or confined area so it is easy to get to for the dog.
keep an eye on vital signs and if there is any change in these see your vet.
Here is a link to take you through the vital signs