My puppy's spay site looks bad 5 months later. Is it stitches?

The sutures take months to fully dissolve and it may be a reaction associated with the remaining suture. It could also be unrelated and be a bite wound. It seems very inflamed and possibly infected. I would have your vet check it to see if antibiotics are needed and what the cause is

It looks like a bit of suture reaction - this is very common and goes away on it's own. As long as there isn't anything coming out (like pus) from the area and it's not bothering her, just leave it alone and keep an eye on it. If she's lethargic, has poor appetite, is trying to lick it, or has any discharge, she should go back to the vet to see if she needs antibiotics or other testing. But 9 times out of 10 (probably even better than that) these need no treatment - it's just the body dealing with having something inside that shouldn't be there. The sutures will dissolve over the next month or so and the reaction will go away. I hope that helps and good luck!

The vet most likely used a suture material for the spay that takes a very long time to dissolve (like PDS) and she is having a reaction to that suture material that is still left there. I would not be worried about this unless it abscesses and opens. For now, just monitor it.

It looks like there could be some inflammation at the site of the incision. That could be due to her body breaking down the sutures, or she caused some sort of trauma to the area. If she is acting normal and you don't feel any swelling around that area I would wait and see if it improves. But if there is swelling, drainage, or pain I would worry about a dehiscence (opening of the incision) which would be an emergency and she should see a vet immediately.

While it can take a long time for sutures to dissolve, and may cause some swelling or irritation, if the area is still very inflamed, is bothering Mikasa, you're seeing sutures actually coming out of the incision site through the skin, or the area is hot to the touch or lumpy, I'd get a second opinion from another vet. It's possible there is an ongoing reaction under the skin that needs to be addressed, or the sutures removed and the area examined to check for other causes. Until you can get to the vet, making sure to keep the area clean and dry to prevent infection, and keeping Mikasa from licking at it is best.

From the picture, that looks like a suture reaction, which is common a month or two out from surgery as the internal suture material is dissolving. If there is no discharge and it's not warm to the touch, and she's otherwise normal, it shouldn't need medical attention. However if it starts to bleed or have discharge, take her in for a check up

That looks like it's healing pretty well at this stage. Keep an eye on it for any redness, bleeding, seeping, swelling or her feeling sick or lethargic. Keep her confined, going outside only on a leash and only long enough to go potty for another week or so until she heals completely.