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(If youve ever used a dog whistle, you know this.) Like sirens, howls contain high-pitched sounds, and scientists think that a dog howls when he hears a siren because the dog thinks he is hearing a howl from another dog.That is, the dog thinks he is communicating with another dog!oyotes, wolves and wild dogs travel in packs, raise pups in groups and have an organized social structure. Social animals communicate, and because these three groups of animals are related, it is not surprising that they all use a similar form of communication: howling, barking and growling.
1 Fear: If your dog typically growls at strangers, specific people, such as children or men, or when he is in unfamiliar places, his growls are most likely due to fear. 2  Dogs may also growl in situations which trigger fears, such as during thunderstorms. Pain: If dog growling is a reaction to pain or illness, you may notice that he only growls when certain parts of his body are touched. 2  He may also show other symptoms of illness or injury, such as decreased appetite, lethargy, weight loss, biting or licking specific areas of his body, or hair loss.