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I am sorry to hear about your pet's discomfort. Unfortunately, dogs do not handle over the counter pain medications as well as people so and ibuprofen has a very narrow margin of safety in dogs and I do not recommit and using it. Ibuprofen (the active ingredient in mortin) can cause acute kidney injury and gastric or intestinal ulceration even at therapeutic doses. The Non steroidal anti-inflammatory medications that are approved for dogs are safer, although in rare cases the same side effects can occur.
Bandaging will help with pain as this will protect the quick (sensitive part of the nail) until it becomes desensitized.
I would be concerned about aspirin making the bleeding worse so your best bet is a medication that is prescribed by your veterinarian. Since the bandage is protecting the sensitive part of the nail, you can monitor overnight and in the morning for pain and if you think he is still painful, take him in to be examined so your vet can prescribe an appropriate pain medication for your dog. If you think that he is uncomfortable and unable to rest tonight your best option would be to take him to an emergency vet.
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All the Best,