Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This may or may not be related to the surgery. Certainly it is the largest event associated with the abdomen within the past few weeks. With regards ***** ***** possible post-op complication I would be worried about infection (uterine stump, abdominal) or retained object after surgery (rare but is possible to leave a sponge or something in the abdomen). This is too far after surgery to worry about bleeding, although I did have one dog with hemophilia that bled for 3 weeks postop in a slow manner that we finally identified but she had signs of progressive weakness (no abdominal pain).
Unrelated to surgery with this level of pain we must consider pancreatitis at the top of our list. Other possibilities might include ingestion of unusual item that is trapped in the digestive tract or making its way through, back pain (intervertebral disk disease or discospondylitis), and the list continues.
Very appropriate steps to do next would be lab work (CBC, chemistry profile with electrolytes, urinalysis) to start which will help screen the pancreas, look for systemic infection, rule out a liver/kidney issue or profound urinary tract infection. AFter this I would do an xray to make sure there is no obvious foreign object in the abdomen or other obvious issue like fluid. After this abdominal ultrasound is indicated to look at the uterine stump and other areas as best possible associated with surgery.
I am quite worried about her. The tachycardia and increased panting might suggest pain. If your vet is unwilling to offer all of this testing then I would definitely seek out a second opinion or get a referral to see an internal medicine specialist to evaluate her.
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