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What is the significance of my dad's great-great-uncle Henry's relationships with dogs?

Dogs are capable of recognizing human emotions through visual and auditory cues.

The relationship between humans and dogs can be traced back to around 20,000-40,000 years ago, during the last Ice Age.

Dogs were likely the first animals to be domesticated by humans.

Dogs have been shown to be able to understand up to 250 words and gestures, similar to that of a 2-year-old child.

Dogs have a sense of time and can anticipate regular events, such as meal times.

Dogs have a part of their brain that is similar to the human amygdala, which is responsible for emotions, memory, and decision-making.

Dogs have been used in various roles throughout history, such as hunting, herding, and as service animals.

A study published in the journal Circulation found that owning a dog can decrease your risk of cardiovascular disease.

Different dog breeds have different strengths and weaknesses, such as some breeds being better at certain tasks than others due to their size, shape, and temperament.

Dogs have a well-developed sense of smell, which is estimated to be between 10,000 to 100,000 times more sensitive than a human's.

Dogs have been shown to be able to detect cancer and other diseases in humans by smelling their breath.

Dogs have a unique way of communicating with humans through body language, facial expressions, and barks.

Dogs have the ability to dream, just like humans.

A dog's heart beats between 70 and 120 times per minute, compared to a human's which is between 60 and 100 beats per minute.

Dogs have a similar structure to human ears, but their hearing is much more sensitive, able to hear sounds four times further away than a human can.

Dogs have three eyelids, an upper lid, a lower lid, and a third eyelid called the nictitating membrane that helps keep the eye moist and protected.

Dogs have a wider color range in their vision compared to humans and can see blues, yellows, and grays but not reds and greens.

Dogs have a gestation period of about 63 days, similar to humans.

Dogs have a higher body temperature than humans, ranging from 101 to 102.5 degrees Fahrenheit (38.3 to 39.2 degrees Celsius)

Dogs have a part of their brain called the "reward center" that releases feel-good chemicals like dopamine, oxytocin, and serotonin when they are praised or given treats, similar to how humans feel when they are rewarded.

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