Knowledge of how to give cattle injections or shots, be it sub-subcutaneously (SQ; under the skin), intramuscularly (IM; directly into the blood supply of the muscle), or intravenously (IV; directly into the vein, usually the jugular vein), is very important in order to be able to vaccinate or treat cattle with vaccines or medicines, respectively. A cow, bull, heifer, steer or calf does not have to be sick in order to be given an injection, many cattle that are perfect healthy are required to get injections or shots for annual vaccinations or booster shots.
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2 Amino, N. “Autoimmunity and Hypothyroidism.” Bailliere’s Clinical Endocrinology and Metabolism. . National Library of Medicine, Aug. 1988. Web. 19 July 2017.
4 Hu, Y. M., W. Liu, and G. H. Lu. “[Significance of Combining Tests of Thyroid Autoantibodies in Differential Diagnosis between Graves’s Disease and Hashimoto’s Hyperthyroidism].” Zhonghua Yi Xue Za Zhi. . National Library of Medicine, 10 June 2003. Web. 19 July 2017.
The question really ought to be who should inject Botox. The laws vary from state to state as to who is allowed to inject and with what amount of supervision, but Botox is a powerful neurotoxin that can cause significant problems that don't readily resolve. As a controlled substance, injectors should be physicians or under the direct supervision of physicians when injecting. Beware of places where an MD has put their name on a medical spa, but is never seen in person. These places often are operating under his/her name only, not his/her supervision.