(FILES) A dog jumps into a pool at the 'Dogs and Fun' fair at the Westfalenhallen congress centre in Dortmund, western Germany, on May 24, 2024. Those tiny, fluffy dogs walking down the street may look cute, but beware: they probably have some wolf in themThat is the discovery announced by US scientists on November 24, 2025, who were surprised to find that nearly two thirds of all dog breeds have a detectable amount of wolf DNA. And it is not genetic leftovers from when dogs originally evolved from wolves around 20,000 years ago, but instead suggests that domesticated dogs and wild wolves have interbred within the last few thousand years. (Photo by INA FASSBENDER / AFP via Getty Images)

(FILES) A Patou Pyrenean Mountain Dog stands between sheep as they are relocated to higher grazing pastures during the transhumance, near Bagneres-de-Bigorre, southwestern France, France on June 14, 2025. Those tiny, fluffy dogs walking down the street may look cute, but beware: they probably have some wolf in themThat is the discovery announced by US scientists on November 24, 2025, who were surprised to find that nearly two thirds of all dog breeds have a detectable amount of wolf DNA. And it is not genetic leftovers from when dogs originally evolved from wolves around 20,000 years ago, but instead suggests that domesticated dogs and wild wolves have interbred within the last few thousand years. (Photo by Ed JONES / AFP via Getty Images)

(FILES) A Tunisian Sloughi hunting dog plays in a field in Cap Angela, in the Bizerte region on May 22, 2025. Those tiny, fluffy dogs walking down the street may look cute, but beware: they probably have some wolf in themThat is the discovery announced by US scientists on November 24, 2025, who were surprised to find that nearly two thirds of all dog breeds have a detectable amount of wolf DNA. And it is not genetic leftovers from when dogs originally evolved from wolves around 20,000 years ago, but instead suggests that domesticated dogs and wild wolves have interbred within the last few thousand years. (Photo by FETHI BELAID / AFP via Getty Images)

(FILES) Head of the breeding program Manuel Gaillard holds two puppies of the Saint Bernard dog breed during a press visit ahead of the inauguration of the Barryland museum and parc in Martigny, in the Swiss Alps, on June 26, 2025. Those tiny, fluffy dogs walking down the street may look cute, but beware: they probably have some wolf in themThat is the discovery announced by US scientists on November 24, 2025, who were surprised to find that nearly two thirds of all dog breeds have a detectable amount of wolf DNA. And it is not genetic leftovers from when dogs originally evolved from wolves around 20,000 years ago, but instead suggests that domesticated dogs and wild wolves have interbred within the last few thousand years. (Photo by Fabrice COFFRINI / AFP via Getty Images)

Astronaut Sophie Adenot (R) speaks during a press conference regarding her departure for the International Space Station (ISS) in 2026, at the CNES, Centre national d'études spatiales (National Center for Space Studies) in Toulouse, southwestern France on November 24, 2025. (Photo by Valentine CHAPUIS / AFP via Getty Images)

French astronaut Sophie Adenot speaks during a press conference regarding her departure for the International Space Station (ISS) in 2026, at the CNES, Centre national d'études spatiales (National Center for Space Studies) in Toulouse, southwestern France on November 24, 2025. (Photo by Valentine CHAPUIS / AFP via Getty Images)

Astronaut Sophie Adenot (C) speaks during a press conference regarding her departure for the International Space Station (ISS) in 2026, at the CNES, Centre national d'études spatiales (National Center for Space Studies) in Toulouse, southwestern France on November 24, 2025. (Photo by Valentine CHAPUIS / AFP via Getty Images)

French astronaut Sophie Adenot speaks during a press conference regarding her departure for the International Space Station (ISS) in 2026, at the CNES, Centre national d'études spatiales (National Center for Space Studies) in Toulouse, southwestern France on November 24, 2025. (Photo by Valentine CHAPUIS / AFP via Getty Images)