Thanks for the additional information.
I am very sorry to hear that Sheldon has been shaking and acting lethargic. Based on what you are describing, he sounds like he is uncomfortable either in his back, his belly or his anal area. Here are some of the more common causes of discomfort in these areas:
Back pain can be due to multiple reasons, here are some of the possibilities:
- IVDD - intervertebral disc disease - basically a bulging disc in the spine that causes some pressure on the spinal cord, back muscles
. This can be mild enough to cause some pain or unfortunately more severe to where the disc material pushes on the spinal cord enough to cause paralysis to the back legs.
- Muscle strain/sprain or soft tissue injury - This is the same thing that happens commonly in people. The muscles tighten up and can cause quite a bit of discomfort.
Other possibilities such as tick borne diseases, trauma to the bones
and infections are possible but are less common.
- An anal sac or gland infection is possible. These glands sit in the anus and sometimes will get very full of fluid that does not drain which can cause an impaction and then an infection. Most dogs will drag their rear ends and try to lick at the rear end area if this were the case.
- Abdominal pain could be caused by an upset stomach
, a kidney or urinary tract infection, a urinary bladder stone or even gall bladder disease. His symptoms to me seem much more like back pain though even if you cannot find a specific area that is hurting him.
At this point, resting Sheldon is the best way to make sure that he does not get worse. I would definitely recommend taking him to your vet after the weekend for an exam, but you can give him some aspirin tonight. His dose would be 1.5 tablets of baby aspirin (81 mg per tablet) every 12 hours. This should help with some of the pain.
Make sure that he does not start dragging his legs in the back as this would indicate a worse problem. If this is seen he should be seen by a veterinarian tonight.
Hope this helps -please feel free to reply if you have any other questions. If you are satisfied with my answer please do not hesitate to click on the "excellent service" button as this will compensate me for my time. Thank you in advance!