"The humanity which would prevent human suffering is a deeper and truer humanity than the humanity which would save pain or death to animals."—Charles W. Eliot.
Contrary to current ideas, cancer seems to be as widespread as are animal species. Although numerically more common in man, the statistics of Fröhner,1 Sticker2 and Semmer3 show that from 5 to 8 per cent. of sick dogs suffer from cancer; that the mortality from tumors among pet dogs is surprisingly high; and that it is probable that the later periods of canine existence are even more afflicted than are similar periods of human life. In horses, swine and cattle, tumors are much less frequent, but particular forms of cancer, as melanoma in the horse and cancer of the eyelid in cattle, are relatively common. In birds lymphoma is a common and fatal form of malignant tumor, while some varieties of cancer have been
EWING J. ANIMAL EXPERIMENTATION AND CANCER. JAMA. 1910;LIV(4):267–269. doi:10.1001/jama.1910.92550300001001k
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