Should I be worried about my dog's red neuter incision from the cone?

Hello and thank you for reaching out to Petco Pet Education Center, formerly Petcoach. The red area next to his incision looks like some bruising that likely occurred due to trauma/pinching of the area during surgery. Bruising can worsen during the first 2-3 days following a procedure, but should start to improve after that time. The dried blood/crusting around his incision is not abnormal either. If Charlie Brown will tolerate it, you can gently wipe the crusting away using a damp wash cloth once daily, but not any more frequent than this. I definitely recommend keeping Charlie Brown's Elizabethan collar on AT ALL TIMES until his sutures are removed by your veterinarian to prevent him from licking at the area and causing trauma/increasing the risk of an incisional infection. If the bruising worsens after day 3-4 post-op, and/or you notice yellow/thick, foul-smelling discharge, and/or if any of the sutures seem to have fallen out, I recommend having Charlie Brown seen by your veterinarian right away. Otherwise, I recommend monitoring the area and keeping his E-collar on. Best of luck with Charlie Brown! And THANK YOU for neutering your pet!