其實貓狗受病毒感染、遇車禍、貧血或做手術，都有機會需要輸血。在美國、英國等地都有一些寵物血液銀行，年齡及體重合資格的健康貓狗均可捐血，幫忙其他有需要的寵物。

cats and dogs would need blood transfusions when they got virus attacks, car accidents, anemia or undergo surgery. In countries like US and UK, there are blood banks for pets. Healthy cats and dogs with qualified age and weight can be blood donors to save other pets.

https://www.mnn.com/family/pets/stories/doggy-blood-donors-save-lives