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Animal psychology

It is definitely possible to train a dog with toys if you start very early," said the lead researcher from the University of Florida. "This is what we do with search and rescue dogs, we start very early with toys as reinforcers."
A dog wagging its tail is one example, and we usually interpret a wagging tail as a sign that the dog is happy. But that's not the only way dogs can express their joy, and there are many animals that don't have a tail or don't use it to talk to each other.
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