- United States. Department of Agriculture11
- American Veterinary Medical Association9
- Hadwen, Walter R. (Walter Robert), 1854-19328
- Massachusetts Society for the Prevention of Cruelty to Animals8
- Tait, Lawson, 1845-18998
- People's Dispensary for Sick Animals (Great Britain)7
- Cobbe, Frances Power, 1822-19046
- Royal Society for the Protection of Birds6
- Caras, Roger A.5
- Fox, Michael W., 1937-5
- Humane Society of the United States5
- Bayly, Maurice Beddow4
- Bergh, Henry, 1811-18884
- Francione, Gary L. (Gary Lawrence), 1954-4
- Humane Education Institute of Africa4
- Moore, G. E. (George Edward), 1873-19584
- Slater, Isobel4
- American Anti-Vivisection Society3
- Bell, Ernest3
- Church, Jill Howard3