Chemotherapy is very well tolerated in most dogs and cats. Most patients experience no side effects. Around 15% will have mild side effects that will last for a few days and many will improve on their own. About 5% of patients can experience more moderate side effects and less than 1% can have more severe/fatal side effects. Cats tend to tolerate chemotherapy even better than dogs, and both tend to handle chemotherapy better than people.
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Also:
https://www.advetcc.com/cancer-care/frequently-asked-questions-about-chemotherapy/