Is a pink blister normal on my dog's spay incision after 3 weeks?

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.

This could be a local tissue reaction to the internal sutures. It can happen, and it's good that it's gone down. Keep an eye on it, and if it gets bigger or doesn't go away, have Nova seen by a vet.

This appears to be healing just fine. I suspect this is a mild reaction to the stitches under the skin. This is very common. I would only be worried if it opens up and starts draining fluid, gets much larger or becomes very red. Just make sure she cannot lick it until it is completely healed.

It is not uncommon for dogs to have a mild reaction to under the skin sutures. As long as there is no pain, discharge, odor, or opening of the areas with suture sticking out, it will likely resolve with time. It takes a long time for sutures to dissolve. See your vet if she is bothering the area or you notice any of the signs above. I hope this helps and thank you for using Petco Pet Education Center, formerly Petcoach!

I think it looks just fine actually. Probably a little local reaction to the underlying stitches. I suggest spraying it with this spray once a day for a week. It should be just fine! ( http://www.allivet.com/p-855-aluspray-aerosol-bandage.aspx ) Hope this helps. Best wishes.

This doesn't look perfect but definitely does not look too bad either, there is some bulging as you mentioned, probably because the stitches have been put on a little too tight, as long as the stitches hold though i would not be too worried, you need to make sure she does not lick the area (i assume she has an E-collar on) and make sure the incision does not open up, the swelling should start resolving within a couple days from now. as long as it does not look worse than this i would be ok keeping her at home, you can still take her for short walks without any issues and your vet needs to see her at some point but it is not urgent (usually post opps are done 3 days and 10 days after the surgery).

Based on what I can see in these photos, the incisions appear to be healing. Occasionally there is dried blood from surgery, but sometimes it can bleed a little after surgery, especially if the dog is too active. I recommend monitoring for increasing bleeding, swelling, heat, or licking of the area and seek veterinary attention if you notice any changes. Thanks for using Petco Pet Education Center, formerly Petcoach.