Comparative Anatomy: Canine vs Human

Dog_Muscles_comparative_anatomy

Written by Mary Sims

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Post Published Date

14th September 2019

DOGS Vs HUMANS – ANATOMICAL DIFFERENCES

DOG

HUMAN

Body temperature – 38.3°C – 39.2°C (101°F – 102.5°F)

Body temperature ~ 37°C (98.6°F)

Has around 320 bones in its body (depending on length of tail).  The extra bones of the dog are attributed to the extra teeth and vertebrae

Has a total of 206 bones, 106 of which are in the hands and feet; 27 in each hand and 26 in each foot

Has no clavicle (collar bone), as such, making the dog unable to put its foreleg behind its back.  The dog’s shoulder stability and movement relies purely on a group of shoulder girdle muscles which sling in and stabilize the foreleg.

Has a clavicle (collar bone) which serves several functions.  It serves as a rigid support from which the scapula and free limb are suspended; it keeps the upper limb away from the thorax so that the arm has maximum range of movement.

Composition of Spinal Column by Area :

Cervical (Neck) – 7

Thoracic (Middle Back) – 13

Lumbar (Lower Back) – 7

Sacrum (Top of Pelvis) – 3

Coccygeal (Tail bone) – Up to 23 (tail length dependent)

Composition of Spinal Column by Area :

Cervical (Neck) – 7

Thoracic (Middle Back) – 12

Lumbar (Lower Back) – 5

Sacrum (Top of Pelvis) – 5

Coccygeal (Tail bone) – 3 – 5

3 skull types :

Brachycephalic – flat nosed, respiratory function affected

Dolichocephalic – long nosed with elongated skulls

Mesaticephalic – medium nosed

3 skull types in Human Anthropology :

Caucasian

Asian

African

Has 42 teeth, classed as a carnivore with sharp and pointed teeth for ripping flesh.
Has 32 teeth, classed as omnivore with incisors for cutting and molars for grinding & crunching plants
Has up to 220 – 300 million scent cells in its nose. Some dogs are able to trace scents from more than 1 mile away and are able to process chemicals such as adrenaline and pheromones of the human.
Have a mere 5 million scent cells in their nose.

Has a unique nose print

Has a unique finger print

Number of Chromosomes – 78 (39 pairs)

Number of Chromosomes – 46 (23 pairs)

Have a digestive tract length of approx. 3 times their length, and a strong stomach acid of pH 1-2

Have a digestive tract length around 30ft and a stomach acid of pH 1.5 – 3.5

Most have a total visual field of 250 degrees

Host have a total visual field of 180 degrees

Average heart rates :

Large dog breeds : 60 – 100 BPM

Small dog breeds : 100 – 140 BPM

Average heart rate :

Approx. 72 BPM

Average pregnancy lasts 63 days, but can vary from 58 to 68 days

Average pregnancy lasts 266 days

Have about 1,700 taste buds clustered around the tip of the tongue.  The taste buds allow dogs to detect sweet, bitter, sour and salty tastes.

Average has about 10,000 taste buds, but not all on tongue.  Also on inside of the cheeks, roof of the mouth, lips (these are especially sensitive to salt)

Fastest domesticated dog reaches an average speed of 45MPH

Fastest speed of a human running was set by Usain Bolt, who achieved a sprint speed of nearly 28MPH

No. of hours sleep – 12 hours

No. of hours sleep – 7-9 hours

Raw food takes 4 – 6 hours to digest, while dry food takes 10 – 12 hours in stomach

Takes 1 – 2 hours to digest food in stomach

Only have 2 colour sensitive cone cells in the retina which sense yellow and blue.  Dogs are red/green colour blind, estimated 6 times less effective than human eyesight.  Have an ‘extra eyelid’ – the nictitating membrane which slides across the eye to prevent damage from dust and undergrowth – commonly called the 3rd eyelid
Have 3 different colour sensitive cones located in their retina which sense red, green and blue.  Humans don’t have a nictitating membrane ‘3rd eyelid’

Can hear up to 60 kHz.  18 muscles are used to move the ears of dogs with prick ears enabling the ears to move and improve hearing.

Can hear frequencies ranging from 12 to 20 kHz.  Have a pathetic 3 ear muscles.

Only able to sweat from their paws and their nose and rely on cooling themselves down through panting and via the cooling of their ears.

Able to sweat using glands all over their body, such as under armpits, the groin and the eccrine glands

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