American and Chinese language authorities investigated the supply of the contamination linked to pet deaths, and Chinese language authorities closed down Xuzhou Anying Biologic Technology Development Firm and Binzhou Futian Biology Technology Co. Ltd., the two companies linked to the contaminated merchandise. Euthanasia (also called placing down or large dog car seat placing to sleep) is one other technique that has been used when dealing with animals who could endure from terminal illnesses, step in dog harness injuries, or over-population in shelters, though many veterinarians don't consider this to be an ethical use of their assets for younger and wholesome animals, whereas others argue that euthanasia is a extra humane choice than leaving a pet in a cage for very lengthy durations of time.