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The dark blue, teal, and gold tapetum lucidum from the eye of a cow Retina of a mongrel dog with strong tapetal reflex. The tapetum lucidum (Latin for 'bright tapestry, coverlet'; / t ə ˈ p iː t əm ˈ l uː s ɪ d əm / tə-PEE-təm LOO-sih-dəm; pl.: tapeta lucida) [1] is a layer of tissue in the eye of many vertebrates and some other animals.
The Old English Sheepdog is a large breed of dog that emerged in England from early types of herding dog. Other names for the breed include Shepherd's Dog and bob-tailed sheep-dog. [1] The nickname Bob-tail (or Bobtail) originates from how dogs of the breed traditionally had their tails docked.
The New Zealand Heading Dog has since been an integral part of sheepdog trials, which began in New Zealand as early as 1867 in Wānaka. [3] The competitive dog sport involves herding sheep around a field and into enclosures. [4] The Heading Dog is the fourth most common breed of dog in New Zealand. [5] Two New Zealand Heading dogs in eastern ...
Based on a sample of 48 still-living dogs, the most common health concerns noted by owners were eye problems (red eye, epiphora, conjunctivitis, and cataracts). [10] Dermatological and respiratory problems also ranked high. The Australian Shepherd is one of the more commonly affected breeds for an autosomal recessive mutation of the MDR1 gene. [11]
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The McNab Dog, also called the McNab Shepherd or McNab Collie is a herding dog that originated in Hopland, Mendocino County, Northern California. The McNab was bred to withstand the tough conditions found in California such as heat, burrs, foxtails , and rugged terrain.
The dogs work in groups; three or four dogs are an adequate defense against wolves and stray dogs. Their function is mostly one of dissuasion, actual physical combat with the predator being relatively rare. [19] Nevertheless, working dogs may be fitted with a roccale (or vreccale), a spiked iron collar which protects the neck in combat. [19]
Sheepdog or shepherd dog – a dog used to move and control sheep, often very highly trained. Other types of dog may be used just to guard sheep (see livestock guarding dog), and these are sometimes also called sheepdogs. See also eye dog and huntaway. Sheep – the species, or members of it.