My dog licked incision red & swollen. Are sutures open? Vet check?

Thank you for using Petco Pet Education Center, formerly Petcoach! From the photo, it looks like Milo has sutures under the skin, which you cannot see. There does seem to be a mild amount of swelling and redness of the incision, and a very slightly opened area. Swelling and redness, especially if accompanied by discharge, are signs of infection. Milo should definitely be wearing his E-collar at all times. Licking and chewing can cause the sutures to loosen and the incision to open. You can apply a warm compress the the area several times a day to reduce swelling and promote healing. If you notice that incision opens more, there is any bleeding or discharge, or the area feels hot to the touch, Milo should be seen by his vet as soon as possible. I hope this helps and that all is well!