Where the domestication of the dog took place remains debated, with the most plausible proposals spanning Western Europe,[9][28] Central Asia[28][29] and East Asia.[28][30] This has been made more complicated by the recent proposal that an initial wolf population split into East and West Eurasian groups. These two groups, before going extinct, were domesticated independently into two distinct dog populations between 14,000 and 6,400 years ago. The Western Eurasian dog population was gradually and partially replaced by East Asian dogs introduced by humans at least 6,400 years ago.[28][2] This proposal is also debated.[2]
Certain Pacific islands whose maritime settlers did not bring dogs, or where dogs died out after original settlement, notably: the Mariana Islands,[123] Palau,[124] Marshall Islands,[125] Gilbert Islands,[125] New Caledonia,[126] Vanuatu,[126][127] Tonga,[127] Marquesas,[127] Mangaia in the Cook Islands, Rapa Iti in French Polynesia, Easter Island,[127] Chatham Islands,[128] and Pitcairn Island (settled by the Bounty mutineers, who killed off their dogs in order to escape discovery by passing ships[129]).
Every year, between 6 and 8 million dogs and cats enter US animal shelters.[204] The Humane Society of the United States (HSUS) estimates that approximately 3 to 4 million of those dogs and cats are euthanized yearly in the United States.[205] However, the percentage of dogs in US animal shelters that are eventually adopted and removed from the shelters by their new legal owners has increased since the mid-1990s from around 25% to a 2012 average of 40% among reporting shelters[206] (with many shelters reporting 60–75%).[207]
We continually review and update our pet grooming policies, procedures and standards, under the supervision of our Director of Veterinary Medicine, with counsel from a number of independent experts in animal care, behavior and ethics. We continue to train our teams on and reinforce the critical importance of following those policies at all times. Since 2015, we've worked together with the Pet Industry Joint Advisory Council (PIJAC) and the Professional Pet Groomers & Stylists Alliance (PPGSA) to encourage and support national health and safety standards for the grooming industry. We believe these standards are critical to the wellbeing of pets everywhere, and we continue to work with other pet industry leaders to encourage industry-wide adoption and adherence to them.

Certain Pacific islands whose maritime settlers did not bring dogs, or where dogs died out after original settlement, notably: the Mariana Islands,[123] Palau,[124] Marshall Islands,[125] Gilbert Islands,[125] New Caledonia,[126] Vanuatu,[126][127] Tonga,[127] Marquesas,[127] Mangaia in the Cook Islands, Rapa Iti in French Polynesia, Easter Island,[127] Chatham Islands,[128] and Pitcairn Island (settled by the Bounty mutineers, who killed off their dogs in order to escape discovery by passing ships[129]).

Wolves, and their dog descendants, likely derived significant benefits from living in human camps – more safety, more reliable food, lesser caloric needs, and more chance to breed.[135] They would have benefited from humans' upright gait that gives them larger range over which to see potential predators and prey, as well as better color vision that, at least by day, gives humans better visual discrimination.[135] Camp dogs would also have benefited from human tool use, as in bringing down larger prey and controlling fire for a range of purposes.[135]
Brush the dog's teeth.[2] Ideally, brushing your dog’s teeth every day with dog toothpaste is the route to healthy teeth and gums. Use dog toothpaste instead of human products, so you don't poison your dog with fluoride. If there is any chance that you may get bitten by your dog, do NOT attempt to brush your pet’s teeth. At any point, if the dog gets overwhelmed, give him a break to calm down.
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