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7 Hunger
It happens that, in a hurry to work or on business, people forget to fill the pet's bowl with food. And the dog begins to get nervous and anxious, expressing his feelings with an unhappy "song".
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Dogs are social creatures. And often, hearing a song or the sounds of a musical instrument, they begin to “sing-along”. This trait is not particularly common among four-legged friends: most of them are indifferent to music.
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9 Puberty
Puppies during the period of active growth often howl for no apparent reason, simply due to the play of hormones.
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