Most owners catch surgical complications a few days too late. By the time something looks obviously wrong, an infection may have spread past the point where a simple antibiotic fixes it. The warning signs are usually smaller than people expect, and they show up in places you’re already looking: the incision, the food bowl, the thermometer, and how your dog puts weight down.
This is general information, not veterinary advice. When in doubt, call your surgical team.
1. Any change at the incision
- Normal: a little light red fluid in the first hours; redness and swelling at the edges for the first 48 hours.
- Not normal: discharge turning yellow, green or cloudy, or smelling bad. Odor plus discharge is one of the clearest signs of infection and needs a same-day call.
- Not normal: redness or swelling that spreads or worsens after two days.
- Emergency: closed skin starting to separate (dehiscence), usually from licking, too much activity or a failed suture.
2. Fever
A healthy dog’s temperature sits between 100 and 102.5°F. Above 103°F is a true fever, usually meaning the body is fighting infection, often at the surgical site. A rectal thermometer is the only reliable way to check at home. At 106°F, it’s a life-threatening emergency.
3. Appetite and energy that never turn the corner
Skipping a meal or two and seeming groggy for 24 to 48 hours after anesthesia is normal. Still refusing food after two full days, or getting more lethargic each day instead of less, is not. Healing dogs trend upward. If your dog seems worse today than yesterday, act on that.
4. A new lump near the incision
- Seroma: a soft, painless pocket of fluid under the skin that usually resolves within a couple of weeks.
- Hernia: the muscle layer hasn’t fully closed, letting fat or intestine push through. A hernia often feels like it can be pushed back in; a seroma can’t.
Any lump that’s growing, painful, warm or leaking needs a vet visit.
5. Not bearing weight on schedule (orthopedic surgery)
After procedures like a torn ligament repair, most dogs put some weight on the leg within a few days, with moderate weight-bearing by about two weeks. If your dog still won’t touch the paw down at two weeks, or stops using a leg that had been improving, it can point to implant loosening, a healing problem or a new joint injury. Mention any sudden clicking or grinding to your surgeon.
The takeaway
None of this needs special equipment: just a daily look at the incision, a hand on the belly or leg, and asking whether today looks better than yesterday. A phone call costs five minutes. Waiting costs your dog time it can’t get back.
