This is Dr. Christian.
You can try 2 adult buffered 325mg aspirin twice daily for pain. Only give this for 2-3 days due to the possibility of stomach upset. Give him some strict rest for 4-5 days. If he does not improve or if he is not carrying any weight on it then I would recommend taking him in to your vet. Keeping the foot wrapped and applying the antibiotic ointment is a great idea. If the toe becomes swollen and red then he'll need to be seen and may require antibiotics. If you have more questions please let me know.