Objective To report outcomes of dogs with common calcanean tendon (CCT) ruptures treated with a platelet‐rich plasma (PRP) enhanced nonabsorbable loop‐suture technique. Study design Retrospective case series. Animals Client‐owned dogs (n = 12). Methods Medical records (2015–2017) of dogs with CCT ruptures repaired with a loop‐suture tenorrhaphy and autogenous leukoreduced PRP were reviewed for signalment, history, type of injury, treatment, and clinical follow‐up. Outcomes were assessed by functional anatomic measurements and Canine Orthopedic Index (COI) scores transformed to percentages, with 100% representing no problems. Results Twelve tendons were treated. Two dogs had major complications that were successfully revised. Follow‐up was available in 11 of 12 dogs, with a median time of 12 months (range, 4–36), including COI for 11 dogs and anatomic measurements for 6 dogs. Anatomic measurements did not differ between treated and normal contralateral limbs (midthigh muscle mass P > .99, cranial tibial muscle mass P = .37, CCT diameter P = .08, tibiotarsal joint angle P > .99). Owners scored function (COI) as 96.4% (range, 93.3%–97.8%) and quality of life as 94.6% (range, 92%–98.2%). Conclusion Loop‐suture tenorrhaphy with application of autogenous leukoreduced PRP at the repair site resulted in restoration of functional anatomic measurements, high COI, and client satisfaction. Clinical significance Loop‐suture tenorrhaphy with local application of autogenous leukoreduced PRP appears to offer an acceptable option to treat CCT injuries in dogs.