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   amount      creatures      distances      efficient      elbows      endurance      evolutionary      fewer      habits      like      million      particular      paws      physique      prey      research      slowly      smaller      species      today  
New says climate change transformed dogs from resembling cats to how they look . Researchers in the USA believe that 40 years ago, dogs were and hunted and ambushed their prey like cats. As the changing climate reduced the of forests in North America, the and food-gathering of dogs changed. Grassland emerged everywhere, which meant dogs had places to hide to ambush their victims. To adapt to this, dogs changed their hunting styles and grew longer legs.

Scientists analysed how dogs evolved by looking at the and teeth of 32 different that lived up to 40 million years ago. The dogs' elbows, in , were good indicators of change. Dogs from 40 million years ago had elbows that were those of cats. Their front swivelled so they could grab and hold on to prey. Elbows changed in dogs to let them become runners. This meant they could chase their prey over long . The teeth in dogs also became more . They became harder so they could hold on to .

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