In 2019, study of wolf samples from northern Italy using very short lengths of mDNA found that two specimens found in the Cava Filo archaeological site near San Lazzaro di Savena, Bologna fell within the domestic dog clade A haplogroup, with one being radio-carbon dated 24,700 YBP and the other stratigraphy dated to 20,000 YBP. The 24,700 YBP specimen matched the haplotype of ancient Bulgarian dogs, 2 historical sled dogs from the North American arctic, and 97 modern dogs. The 20,000 YBP specimen matched the haplotype of ancient Iberian and ancient Bulgarian dogs, Roman dogs from Iberia, and 2 historical sled dogs from the North American arctic. Four dog specimens found in the Bronze Age town of Via Ordiere, Solarolo, Italy dated to 3,600–3,280 years ago shared haplotypes with Late Pleistocene wolves and modern dogs.