Abstract.We used a dog model to test the safety and effectiveness of sutureless gastrointestinal anastomoses (n= 23) (end‐to‐end, end‐to‐side, or side‐to‐side) with the nickel‐titanium double ring with temperature‐dependent shape memory. Results were compared to conventional hand‐sutured anastomoses (n= 5). Examination performed after 2 weeks' follow‐up showed no leaks and no difference in return of bowel function between the experimental groups and the control group. Microscopic studies showed a complete epithelial lining and perfectly functioning anastomoses. We conclude that the nickel‐titanium double‐ring device may have an important place in the armamentarium of the gastrointestinal surgeon.