Welp, his ballsack exploded.
For the 7 days after his surgery, his ballsack slowly became engorged as it swelled with blood. It also started to take on a reddish purple bruising. Googling + calls to the vet confirmed that this was all very normal, despite how abnormal it looked to us. Also, the dog was acting fine.
Until yesterday.
When he woke, he didn't want to leave his cage in the morning. Inspection found some sticky yellow shit all over his empty nutsack, causing his surrounding fur to become matted and stuck. Later inspection even found a small hole in his sack, not where the sutures were, but instead in an area that was seemingly untouched by a scalpel. As the day went on, the dog started acting more normal, but the wound remained. His sack had shrunken quite a bit, though.
After a visit to the vet today, it was found out that, in rare instances (roughly 1/30 neuters), the sack will swell with so much blood that it will actually burst in a weak area. This is what happened here. The created hole had relieved a bit of blood/pus mixture from the poor guy's airsack. While that is technically a good thing, the result was his new interest in licking the area
He's now on a steady dose of antibiotics with semi-frequent antibiotic powderings to clean/dry up the area. He's also in a cone 24/7 until he heals, which will be 3-4 days.
Gross Pic