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11

Short answer In humans it is basically the red choroid plexus in the back of the eye you are seeing on a flashed photo, while it is the green-reflecting tapetum lucidum in dogs. Background The red-eye effect in humans was explained nicely by Yale Scientific Magazine, and I adapted the following text from that source: The human eye can effectively adjust to ...


8

Dogs have a genomic structure that allows breeding with high variation in size, shape, coat quality, color and other qualities particular to each breed as well. Other domesticated animals can be bred for as many qualities, but dogs in particular show a wide level of morphological traits - varying in size from just over a pound to the size of a wolf, from ...


6

There are many commercially available mixed breed ID tests, as a quick Google search will tell you. However, I cannot vouch for their accuracy: this news article may be of interest. Also this. The genetic markers used to identify breeds in a mixed-breed are microsatellite markers (sometimes SNPs): you can read more here, but from the abstract: We used ...


3

Rabbits have been bred domestically since at least ancient egypt. Rabbits vary in size from > 15 kg (35lb) for a Continental Giant to .5kg(1lb) for A small Netherland Dwarf. The American Rabbit Breeders Association recognizes 47 different breeds of rabbit for shows and there are a number of breeds that are either not recognized or are being developed ...


3

It is hypothesized that the starkness of white sclera against darker colors of the pupil and iris is a unique mutation in primates that have become prevalent in human beings because it enhanced our ability to communicate with other humans and animals, including dogs, by more clearly communicating where we are looking. However, it has not yet been ...


3

The habit of burying food in modern dogs is an instinct that came from the grey wolf (Canis lupus) long ago, and originates from a phenomenon called surplus killing, where a carnivore would kill more than it could eat, and often use it at a later time. Many, if not all, carnivores possess behaviour patterns which allow utilization of a kill at a later ...


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A new study published in the journal PLoS One compared facial characteristics, gazing behaviors, and sociality of 26 different canid species (including wolves, bush dogs, and Arctic foxes). The researchers found that animals with eyes and facial features that are easier to discern are more likely to live and hunt socially. (One of the authors, S. Kohshima, ...


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Check out this consensus statement (PMID 17552466): J Vet Intern Med. 2007 May-Jun;21(3):542-58. Guidelines for the identification, evaluation, and management of systemic hypertension in dogs and cats. Brown S1, Atkins C, Bagley R, Carr A, Cowgill L, Davidson M, Egner B, Elliott J, Henik R, Labato M, Littman M, Polzin D, Ross L, Snyder P, Stepien R; ...


1

The dog was probably freaked out by the weird costume. Humans do it all the time (I've been seeing Halloween decorations for sale since early August, which is terrifying) but we generally comprehend what's going on. Dogs may not fully understand the idea of a costume, much as a human infant might be scared by masks or beards (or the sudden removal ...


1

I cannot find any definite articles on why there would be a reason for this behaviour other than the same ones that you have mentioned in your article. It could be because it wants to mark its territory or the dog wants to hide its scent. One point that I would also like to add is force of habit. As Charles Darwin (the father of evolutionary biology) had ...



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