Hi, I'm not sure if this is mange, as I don't have any experience with Mange, but I was thinking that maybe he is getting chewed on or bitten by the other dogs in daycare when they are playing. Maybe they are playing too rough, and causing little bite marks and cuts in his skin, and then they are irritated, infected, or just oozing and then when they dry up, they turn black like a scab? I would speak to the owners of the daycare regarding the problem with fleas, ticks, and other things that Baxter is picking up there. They should be making sure that all the dogs that come to daycare are up to date on all shots, are free of parasites, fleas, and ticks, and they should be treating their facilities if they have a problem with fleas. I would also be asking them if the dogs are playing too rough and if Baxter is getting sores from this. Maybe you can bring him there on a day when you have some time to observe what is happening when he's there. Also a visit to the vet would be a good idea to see if it is Mange, or something else. Please keep us posted.