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The five senses of the dog
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Transcript of The five senses of the dog
![Page 1: The five senses of the dog](https://reader036.fdocuments.in/reader036/viewer/2022062308/55ba8bdebb61eb440a8b4666/html5/thumbnails/1.jpg)
Lynn Barber
Dogs Trust
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The 5 Senses of the Dog
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The 5 Senses
• Sight
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The 5 Senses
• Sight
• Hearing
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The 5 Senses
• Sight
• Hearing
• Touch
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The 5 Senses
• Sight
• Hearing
• Touch
• Smell
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The 5 Senses
• Sight
• Hearing
• Touch
• Smell
• Taste
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Sight
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Sight
• Dogs possess only two types of cone instead of three.
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Sight
• Dogs possess only two types of cone instead of three.
• Dogs are red-green colour blind.
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Sight
• Dogs possess only two types of cone instead of three.
• Dogs are red-green colour blind.
• They see a lighter and less detailed world when compared to humans
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Sight
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Sight
Peripheral vision is better than humans
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Sight
Peripheral vision is better than humans
but distance is not judged quite as well. Dogs excel at night vision and the detection of moving objects.
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Sight
Colour
Dogs see something like a human deuteranope,
that is, they are red-green colour blind (occurs in 4% of male humans). Simply put, this is due to having only 2 cone types rather than 3 (light sensitive cells include cones and rods).
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Sight
Detail or Acuity
Since dogs have no fovea (or area with 100% cones), their estimated eye for detail is (roughly) 6 times poorer than in an average human.
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Sight
Night Vision
Dogs have much better night vision for 2 reasons:– The have more rods (which enable night vision). – They have a structure called the Tapetum Lucidum
This is a reflective surface behind the retina (area including the light sensitive cells) that reflects light back through it (gives the eerie shine at night).
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Sight
Sensitivity to Movement
Dogs are better able to detect movement.
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Sight
• These differences in visual ability make sense in light of evolutionary theory.
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Sight
• These differences in visual ability make sense in light of evolutionary theory.
• Good depth perception and visual acuity are necessary for a primate (from which humans evolved) jumping from tree limb to tree limb.
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Sight
• These differences in visual ability make sense in light of evolutionary theory.
• Good depth perception and visual acuity are necessary for a primate (from which humans evolved) jumping from tree limb to tree limb.
• Good colour vision enabled this primate to choose the ripest and most nutritious fruit.
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Sight
• These differences in visual ability make sense in light of evolutionary theory.
• Good depth perception and visual acuity are necessary for a primate (from which humans evolved) jumping from tree limb to tree limb.
• Good colour vision enabled this primate to choose the ripest and most nutritious fruit.
• The canine, on the other hand, is well adapted as a nocturnal hunter of camouflaged prey.
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Hearing
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Hearing
• Hearing. Dogs have an incredible hearing ability.
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Hearing
• Hearing. Dogs have an incredible hearing ability.
• In fact it is their second most developed sense, next to smell.
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Frequency range
Human
64Hz………………..20KHz
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Frequency range
Human
64Hz………………..20KHz
Dog
67Hz…………………………………..45KHz
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Hearing
• There are many nerves in the pinna of the ear, including the vagus nerve, which slows the heart.
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Hearing
• There are many nerves in the pinna of the ear, including the vagus nerve, which slows the heart.
• Perhaps the basis of 'ear work' in Ttouch.
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Touch
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Touch
• Dogs have the largest concentration of touch sensors on the pads of the paws, thus they are very sensitive to textural changes on the ground or floor
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Touch
• Dogs have the largest concentration of touch sensors on the pads of the paws, thus they are very sensitive to textural changes on the ground or floor
• This textural sensitivity is used in some elements of Groundwork (Ttouch) that help a dog to concentrate and focus.
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Smell
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Smell
• The dog's brain in large part is dedicated to smell.
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Smell
• Depending on the breed a dog will have anything from 125 million to 220 million scent receptors in the brain
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Smell
• Depending on the breed a dog will have anything from 125 million to 220 million scent receptors in the brain
• compared to humans who have 5 million
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Smell
• Its nasal passages are arranged to allow a greater volume of air to be drawn over the sensitive lining
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Smell
• Besides that dogs have sensory cells in their noses that respond to chemicals in the air
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Smell
• Besides that dogs have sensory cells in their noses that respond to chemicals in the air
• This vomeronasal organ is similar to a snake’s Jacobson organ
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Smell
• Research has recently shown that dogs can reliably detect 6 parts in a trillion
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Smell
• Research has recently shown that dogs can reliably detect 6 parts in a trillion
• 100% success for 6 parts in a trillion
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Smell
• Research has recently shown that dogs can reliably detect 6 parts in a trillion
• 100% success for 6 parts in a trillion
• 98% success for 2 parts in a trillion
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That’s the equivalent of us tasting one teaspoon of sugar in
a million cups of tea!!!!
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Taste
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Taste
• A dog's taste receptors are almost identical to ours, their taste buds on the tongue can easily identify salt, sweet, sour, bitter.
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Taste
• A dog's taste receptors are almost identical to ours, their taste buds on the tongue can easily identify salt, sweet, sour, bitter.
• However the fact that their sense of smell is so superior to ours then we can assume this will, in turn, have an enhancing effect on their sense of taste.
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Thank you!