Zoetis Stock Plummets 24.8% YTD: Here's What You Need to Know

Core Insights - Zoetis (ZTS) shares have decreased by 24.8% year to date due to safety concerns regarding its monoclonal antibody therapies for osteoarthritis in dogs and cats, namely Librela and Solensia, which are significant revenue sources for the company [1][8] - The FDA raised alarms about Librela in late 2024 after adverse event reports indicated serious neurologic effects and other health issues in dogs, including seizures and even death [2][3] - An analysis revealed that dogs treated with Librela reported musculoskeletal adverse events at approximately nine times the rate of other osteoarthritis therapies, raising further safety concerns [4][5] - Consequently, Librela and Solensia experienced year-over-year sales declines in the second and third quarters of 2025, leading Zoetis to revise its full-year revenue guidance down to $9.4-$9.475 billion from a previous range of $9.45-$9.6 billion [6][8] Sales and Financial Performance - Librela and Solensia's sales declines have pressured Zoetis' stock, which has fallen 29.9% over the past year, contrasting with a mere 0.3% decline in the industry [7][8] - Despite the challenges in the osteoarthritis segment, Zoetis is seeing strong performance in its parasiticides and dermatology portfolios, which are helping to mitigate some of the revenue losses [9][12] Future Outlook - Zoetis is planning for a potential rebound in 2026 by expanding its product offerings, including new long-acting therapies for osteoarthritis, which aim to enhance treatment adherence and broaden market uptake [11][12] - The company has received approvals for new products like Lenivia and Portela, which are designed to complement existing therapies and provide veterinarians with more treatment options [11][12]