Dog waste DNA helps to catch errant pet owners

A growing number of French municipalities are turning to DNA technology to tackle one of urban life’s most persistent problems: dog fouling. By analysing the DNA found in dog waste and matching it to registered pets, local authorities can identify owners who fail to clean up after their animals, and issue fines accordingly.

While the approach has prompted debate over privacy, costs and enforcement, early results from towns trialling the system suggest it can be highly effective. Several municipalities report a dramatic reduction in dog waste, resulting in cleaner streets and lower cleaning costs.

One of the pioneers is L’Escarène, a small town in the Alpes-Maritimes department, where the system has remained in place since its inception in October 2024. Jean Claude Vallauri, municipal councillor and deputy mayor, said the aim was to significantly reduce dog waste in public spaces and that the measures were proving effective.

He explained that the system functions in four stages: registering dogs’ DNA, collecting dog waste, analysing samples in a laboratory, and issuing fines if the owner is identified.

Mr Vallauri said the town spent around €7,000 to launch the scheme, covering signage and the registration of about 70 dogs, and added that the investment had already saved the municipality roughly €23,000 in cleaning costs. On privacy concerns, he stressed that only the laboratory holds the link between DNA samples and individual dogs.

Larger towns are also reporting success. Béziers (Hérault) introduced its canine DNA programme in July 2023, becoming the first municipality in France to do so. The scheme requires dog owners in designated areas to register their pets’ DNA and carry a ‘genetic passport’.

According to Stéphanie Sandonato, deputy director general of services at the City of Béziers and the person responsible for the programme, the decision was driven by a desire to address antisocial behaviour, improve public hygiene and enhance the city’s image.

“The results have been more than convincing,” she said. After 18 months of implementation, Béziers recorded an 85% reduction in uncollected dog droppings. Far from encountering resistance, she said the system had been well accepted by residents, adding that the city is now “much more attractive, and much cleaner”.

Ms Sandonato emphasised that the positive results had been sustained over time, calling the programme “a success”. More than 1,100 dog owners have registered their pets, and the city allocates around €80,000 a year to operate the scheme. Fines range from €38 for failing to carry a genetic passport, to around €130 if an owner is identified through DNA analysis.

Elsewhere, Saint-Omer (Pas-de-Calais) has reported a 60% reduction in dog waste in its town centre after registering more than 800 dogs, underlining the deterrent effect of DNA registration. Dog owners there are required to carry identification cards when walking their pets in monitored areas.

Other towns, including Reims (Marne), are now testing similar systems, signalling growing interest in this high-tech approach to managing public spaces. While critics continue to raise concerns about cost and proportionality, municipalities trialling the technology appear convinced that, at least for now, DNA may be one answer to a very visible urban problem.