Study finds lower inflammatory stress with laparoscopic dog OVE: full analysis

A newly published clinical trial adds fresh evidence that laparoscopic ovariectomy may be gentler on dogs than a traditional open approach. In the Veterinary Surgery study, healthy anestrus dogs undergoing elective ovariectomy by laparoscopy had a milder and more transient inflammatory and oxidative stress response than dogs treated by laparotomy, with the open group showing more persistent biomarker changes through 7 days after surgery. The paper was published online ahead of print on January 3, 2026. (pubmed.ncbi.nlm.nih.gov)

The question isn’t new, but the evidence base is still evolving. Laparoscopic spay has long been promoted as a less invasive option because it limits abdominal wall trauma and improves visualization, even as clinicians weigh the physiologic effects of pneumoperitoneum, equipment costs, training demands, and case selection. The new study builds on earlier canine work, including a 2014 comparison of laparoscopic and open ovariectomy that found lower oxidative stress and cortisol-related differences under a standardized anesthesia protocol, as well as more recent studies linking minimally invasive approaches with lower inflammatory responses and less postoperative discomfort. (pubmed.ncbi.nlm.nih.gov)

In the new trial, investigators randomized 26 healthy bitches in anestrus to laparoscopic or open ovariectomy, 13 dogs per group. Blood samples were collected before surgery, 2 hours after, 24 hours after, and 7 days after, with analysis focused on interleukin-6 as an inflammatory marker and paraoxonase-1, reactive oxygen metabolites, and biological antioxidant potential as oxidative stress-related measures. According to the abstract, the laparoscopic group showed an early IL-6 rise at 2 hours that returned to baseline by day 7, while the open group had higher IL-6 at baseline, 24 hours, and 7 days. Reactive oxygen metabolites also remained higher in the open group, increasing through day 7, whereas the laparoscopic group showed only a transient peak at 24 hours. (pubmed.ncbi.nlm.nih.gov)

One nuance is that laparoscopy didn’t uniformly outperform open surgery on every marker. Paraoxonase-1 decreased in both groups at 2 hours and remained lower in the laparoscopic group at 24 hours and 7 days, a reminder that oxidative stress biology around surgery is complex and that pneumoperitoneum may have its own effects. Other recent canine literature points in the same direction: minimally invasive procedures tend to blunt the overall inflammatory burden, but they don’t eliminate oxidative changes entirely. A 2025 BMC Veterinary Research paper, for example, reported that laparoscopic ovariectomy increased total oxidative stress, even within what the authors described as a safe protocol. (pubmed.ncbi.nlm.nih.gov)

Industry guidance has increasingly reflected that balance. The 2024 WSAVA reproduction guidelines discuss laparoscopic ovariectomy among the surgical options for reproductive control in dogs and cats, framing decision-making around patient welfare, available expertise, and practice resources rather than a one-size-fits-all recommendation. At the specialty-training level, ACVS fellowship standards in minimally invasive surgery also underscore that laparoscopy is now an established technical pathway in small animal surgery, not an experimental niche. (wsava.org)

Why it matters: For veterinary teams, this paper strengthens the argument that minimally invasive ovariectomy can reduce the physiologic stress of elective sterilization, not just improve the appearance of the incision. That matters when discussing postoperative pain control, recovery expectations, and the value proposition of investing in laparoscopic equipment and training. It may also help practices explain to pet parents why a laparoscopic procedure can carry a different fee structure: the technique often requires more infrastructure, but the emerging evidence suggests measurable biologic benefits tied to reduced surgical trauma. Still, the study was small, limited to healthy anestrus dogs, and focused on biomarkers rather than hard clinical endpoints such as complications, return to activity, or long-term outcomes. (pubmed.ncbi.nlm.nih.gov)

What to watch: The next step is whether future studies, ideally larger and multicenter, show that these laboratory differences consistently translate into better patient-centered outcomes, and whether they help define which dogs benefit most from laparoscopic elective sterilization in everyday practice. (pubmed.ncbi.nlm.nih.gov)