Age determination in dogs is important in many disciplines. For instance, in veterinary clinical practice, knowledge of the exact age of a dog can contribute to establishing a (better) differential diagnosis, prognosis and treatment (Gesierich et al., 2015;Tobias et al., 2000).In zooarchaeology, estimating the age at death of dogs on (bony) remains can give clues in understanding the process of their domestication and the roles dogs played in past societies (Nomokonova et al., 2020). Forensic age estimation, particularly of dogs involved in trade, is yet another application that is gaining more and more importance (Modina et al., 2019;Broeck & Cornillie, 2020). Finally, the adoption of foreign stray dogs is becoming very popular in many Western European countries (Norman et al., 2020). Knowledge of their age can be important for population management (FAO, 2014) and in assessing trainability and longevity after adoption (Tobias et al., 2000;Wells & Hepper, 2000).The most commonly advised age estimation methods for living dogs are the inspection of dental eruption in puppies and the determination of the epiphysial union of the long bones in grow-