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Hello,Thank you for using Just Answer. My name is***** am a veterinarian and will do my best to help.
I am sorry to hear your little dog is painful. He may have a muscle pull, but it could be a pinched nerve or a bulging disc in his back.
You can use a small amount of Arnica topically, but don't let him lick it and eat the ointment. However, if the problem is deeper, in his spine or a disc, it may not help.
How much does he weigh? You could try baby aspirin, if he is eating normally but I need his weight to give you a safe dose.
He could take 30 mg of aspirin, which would be less than 1/2 of a baby or low dose aspirin. I would give 1/4th of a baby aspirin, with food, and if he does not vomit you can repeat that once to twice daily.
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