09/14/2026
š¶ ANOTHER NEW LIBRELA PAPER PET PARENTS SHOULD KNOW ABOUT:
A scientist sent me a brand-new peer-reviewed paper this morning examining a possible biological explanation for some adverse events reported after Librela.
Librela reduces arthritis pain by blocking NGF (nerve growth factor). But NGF does more than transmit paināit also supports sensory nerves involved in bone and joint health, nervous-system function and bladder control.
𦓠THE POSSIBLE āDUAL-HITā
Reducing pain may increase weight bearing on an already damaged joint, while blocking NGF may alter sensory pathways involved in how bone responds to stress. The authors propose this as one possible explanation for reports of rapid joint deterioration, fractures and ligament ruptures.
Research also suggests sensory nerves participate in bone repair and regeneration. Loss of sensory innervation or disruption of TrkA signaling has impaired aspects of fracture healing in experimental studies.
š§ š½ Post-marketing reports have also included ataxia, weakness/paresis, lethargy, behavioral changes/disorientation, impaired consciousness, seizures and urinary problems. Because NGF has roles in neurological and bladder pathways, the authors suggest these effects warrant further investigation. Although this paper does not prove Librela causes these problems, it proposes biologically plausible mechanisms and emphasizes that direct evidence in Librela-treated dogs is still lacking.
Blocking NGF may affect more than pain. We need long-term research to understand those effectsāand, in the meantime, informed consent matters when veterinarians prescribe this drug. Proactive pet parents avoid using it; find a qualified veterinary rehabilitation specialist with many other tools in their toolbox at American College of Veterinary Sports Medicine and Rehabilitation (www.vsmr.org), American Association of Rehabilitation Veterinarians (www.rehabvets.org), or Canine Rehabilitation Institute (www.caninerehabinstitute.com).