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

The scientists analysed how dogs have evolved atbyfrominofonoverto looking atbyfrominofonoverto the elbows and teeth atbyfrominofonoverto 32 different species that lived between two million to 40 million years ago. The researchers said that the dogs' elbows, atbyfrominofonoverto particular, were good indicators atbyfrominofonoverto evolutionary change. Dogs from 40 million years ago had elbows that were more similar to those atbyfrominofonoverto cats. Their function was to allow the front paws to swivel so they could grab and hold atbyfrominofonoverto to prey. Those elbows changed atbyfrominofonoverto dogs to allow them to become endurance runners and thus be able to pursue their prey atbyfrominofonoverto long distances. Teeth atbyfrominofonoverto dogs also altered to be more efficient. They became more hard-wearing to be able to hold atbyfrominofonoverto to prey.