Yes if your dog is suffering from some pain and you want to help alleviate the dogs pain then you can give the dog dog Benadryl for pain.
The dosage of Benadryl for dogs is 1 MG per each pound of the dogs body weight.
If your dog is 10 lbs then you would give the dog 10 MG of Benadryl and if the dog is a 25 lb dog then you would give the dog 25 MG of Benadryl.
You can give the dog the recommended amount dosage of Benadryl 2 to 3 times per day.
Do not give the dog more than 3 doses of the Benadryl for the pain and if the pain persists in the dog then you should take the dog to the vet if possible to find out what is going on.
You can also give the dog some Aspirin to help with the dogs pain.