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Radiation therapy in animals does not cause systemic side effects common in humans such as nausea and decreased appetite. However, your pet may experience fatigue due to repeated anesthesia.
Acute side effects are more common and depend on the dose of radiation given. These side effects occur in the treatment area, resemble a bad sunburn, but typically resolve quickly with care. Discouraging your pet from licking, scratching or biting the area will speed the healing process. Your pet may temporarily lose the hair from the treated area. Dark hair and skin generally re-grow lighter, while light skin and hair generally re-grow darker.
Once treatment has ended, the oncologist will want to periodically examine your pet to determine the effect of the radiation on the tumor and to detect any side effects in their early stages.