No, that's not true. That misunderstanding may come from observing dogs licking their wounds. Dogs' wounds disappear quickly because licking stimulates blood flow, which results in the body paying more attention to the injury. Humans may have assumed that because the healing was quick, the dog's mouth was clean.
But I suppose there's little harm in a dog's mouth regardless of the activities they choose to pursue. Most diseases also aren't communicable between species.
are you saying nathan douchenozzle strider the third of arendelle isnt important hes worth at least two self grooming dogs you dont know what kind of deal youre missing out on here
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