if U think something isn't 'normal' or are just worried, SEE THE VET.
They don't charge for follow-ups on a surgical procedure - it won't take 5-mins total to either allay Ur fears, or be told it needs [skin glue, debriding, _____ ], & get it taken care of.
There's no point in worrying w/o an answer, & we can only offer our opinions as dog-owners.
I'd phone & ask if U can walk-in for a brief visual check. Then U can be assured that all is well, & if there *is* an issue, it's dealt with promptly.
Remember to keep him on-leash for 5 to 7 days [instructions vary depending on the vet] - no jumping, NO off-leash time with other dogs, no hanging out with other dogs in the family [who will helpfully mess with his incision, if he lets them - as he can't reach it, they'll reach it "for him".
] No matter how many times he rolls puppy-dog eyes at U, don't remove the cone-collar
- he can pop his stitches in an instant, using his incisors.
Most dogs sail thru a neuter - the biggest problem is keeping them less active when "I feel FINE, really, i DO!..."
, & they want to race around like eejits, & jump like kangaroos.
The abandoned GSD that i rescued in a trailer-park was begging to play fetch & Frisbee games on the 3rd day post-neuter, & he was 2-YO at the time of surgery - either he had zero pain, or it was so minimal that, like many dogs, he was ignoring it. [Lots of dogs are too stoic for their own good.]