DNA Matching to Enforce Fines
The Ajuntament de Tarragona has started collecting dog faeces from public spaces this week to identify owners who do not clean up after their pets. The samples are being genetically analysed and cross-referenced with a municipal canine DNA census, enabling authorities to issue fines for uncivil behaviour. Over 2,000 dogs are currently registered in the city’s genetic database, according to official figures published on 29 September 2026. The council estimates there are between 10,000 and 12,000 dogs in Tarragona, meaning only around 16.8% to 20.2% of the canine population is registered.
How the System Works
Authorised personnel, including members of the local police (Guàrdia Urbana), municipal staff, or technicians from the contracted company, collect samples using sterile, single-use tools. They take material from the surface layer of faeces, where epithelial cells containing usable DNA are concentrated. Each sample is sealed in a vial, assigned a unique code linked to the city’s traceability system, and transported securely to a laboratory. The lab conducting the analysis is accredited to meet international standards for canine genetic identification (ISAG 2006 or later equivalent). Results identifying a match with a registered dog can lead to enforcement action. If a dog not in the census repeatedly leaves waste in the same area, authorities say they may still pursue its owner based on behavioural patterns, as dogs often walk the same routes at consistent times.
We want a cleaner city, but to achieve that we must combat uncivil behaviour,
Sonia Orts, the city councillor responsible for animal welfare, said the initiative was launched to reduce dog waste in public spaces, which she described as degrading to the urban environment. The DNA registry was established in February 2026 under the city’s animal protection, ownership and sale ordinance, aiming to promote responsible pet ownership and improve public cleanliness.
Registration and Next Steps
The canine DNA registry complements existing microchip identification. Registration involves a painless saliva sample and is voluntary for now. As of late September 2026, 2,141 applications had been received, with 2,015 completed entries. Analysis reports take up to 30 days from sample collection. The city urges dog owners to register their pets via the official municipal portal to avoid penalties if waste is found in high-frequency areas.
Primary sources: barcelona.cat. Reported by tarragonadigital.com, diarimes.com, tarragona.cat, Tarragona Digital.
