Female dog Spaying. Surgery at this age?

If your dog's kidney and liver values are currently normal and she is otherwise healthy, she can generally tolerate spaying surgery well, even at 6 years of age. Modern anesthesia and surgical techniques are quite safe, especially when pre-anesthetic blood tests and proper monitoring are done. Spaying at this age is still beneficial, as it reduces the risk of: Pyometra (a life-threatening uterine infection, common in older unspayed females), Mammary tumors (risk increases the longer a dog remains unspayed), and other hormone-related health issues. However, since she had a history of kidney and liver issues, it is important to: Perform a complete pre-anesthetic workup (blood tests, liver/kidney profile, ECG if needed). Ensure the surgery is done in a well-equipped facility with proper monitoring. Use anesthetics that are safe for dogs with her past history.