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Dogs and cats have been living alongside humans for thousands of years. During this time, they have become not just our assistance animals, but real pets and family members. But despite such close relationships and a long history of communication, sometimes it is difficult for us to decipher their behaviour. Why, for example, do dogs wag their tails? What does the look of a "beaten dog" really mean? What do cats purr about and why are they so demanding about food? In this book you will find answers to these and other questions. Through experiments, scientists and veterinarians are trying to explain the mysterious bonds we have with cats and dogs. But this does not always work out. In some matters, even science is powerless, so we just have to accept everything as it is and enjoy the neighbourhood of these amazing creatures.