Yes, keep them open as they heal. Warm compresses help with that. Also there are ointments vets can give you to pack the wound with that help with tissue granulation, but with a dog that is difficult because they tend to lick their wounds when they can reach them. I had a sheep once with a deep abcess and the tissue granulation ointment worked really well. Watch for flies too, I hate to say.... You definitely don't want them near those wounds.