Susan Krashinsky Robertson, a Globe business reporter, shares her insights on Librela, the controversial arthritis drug for dogs. Some pet owners celebrate its effects, claiming happier, more comfortable pets. However, troubling cases of adverse reactions, including severe lethargy and even death, raise serious concerns. Krashinsky discusses her interviews with pet owners and veterinarians, revealing a critical divide about the drug's safety and the need for better communication in veterinary care. The growing popularity of Librela prompts a closer examination of its risks and regulatory practices.