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New research that climate change dogs from creatures resembling cats to the way they are today. Researchers from Brown University in the USA believe that 40 million years ago, dogs smaller and like cats. They hid, stalked and their prey. As climate change Earth's landscape, the physique and food-gathering habits of dogs changed. Thick forests that once the North American continent started to become less dense as the planet became cooler. The emergence of grassland dogs had fewer places to hide to ambush their victims. To , they evolved their hunting styles and slowly grew longer legs.

The scientists analysed how dogs have by looking at the elbows and teeth of 32 different species that between two million to 40 million years ago. The researchers that the dogs' elbows, in particular, were good indicators of evolutionary change. Dogs from 40 million years ago elbows that were more similar to those of cats. Their function to allow the front paws to so they could and hold onto prey. Those elbows changed in dogs to allow them to endurance runners and thus be able to their prey over long distances. Teeth in dogs also to be more efficient. They became more hard-wearing to be able to hold on to prey.