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How to diagnose and treat tumors in guinea pigs
Locate any lumps on its body.
Take your guinea pig out of its cage and look over its body for any raised, rounded lumps. Use your fingers to brush through its fur to feel for any abnormal growths on its skin.
Choices: [+] Lumps that appear on the belly of your guinea pig may be mammary tumors. They can appear on male or female guinea pigs. [+] Lumps on your guinea pig's hide should be tiny circular bumps associated with the tumors. Also look under and around the underside of a pair of ears for abnormal growths. [+] Animals with tumors normally have hairy, rounded heads and bodies. If you find any of the obvious lumps, they are cancerous and should be removed immediately. [+] If you see any growths, separate them before proceeding. Assess the health of your guinea pig.
Lumps that appear on the belly of your guinea pig may be mammary tumors. They can appear on male or female guinea pigs.