Thanks for using Petco Pet Education Center, formerly Petcoach! I agree with you, this wound does look deep enough that it would require stitches. Further local therapy wound include flushing, debriding and sutures and antibiotics would be recommended as well. I recommend that you have Maverick evaluated by a veterinarian for further assessment and treatment. Usually these wounds are treatable and respond well to appropriate management. Your veterinarian would also be able to prescribe medications for pain as he is likely experiencing pain to some extent. Good luck and have a good night!