We got our dog from a local shelter over a month ago. She was fixed the day before we picked her up and thus far, her incision has healed perfectly. I spend a lot of time with her during the day so even though it appears to be fully healed, I still keep an eye on it. Today I noticed (again, more than a month later) that it is a little swollen and red with a purple-ish bump on the scar. It has me worried, so any information would be great. Thank you!