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Breastfeeding : yes, milk has a distinctive smell, female produce milk, young eat milk is easy idea for a dog. They have had the experience already. The milk smelling prey-sized individuals is to be protected&might or might not register.
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A dog's sense of smell is substantially better than a human's.

In fact, dogs can differentiate anywhere from 30,000 to 100,000 different scents and have 60 times more scent receptors than humans.

A pregnant woman's hormonal changes may cause subtle changes to her scent that are detectable only to her canine companion.

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