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Stress disorders
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According to TheDailyPuppy.com, many dogs are naturally anxious or even stressed. The temperament can vary by breed and environment. Therefore, dogs who lick the floor, rugs, and/or carpet can use this as a way of relieving any anxiety or stress they might be feeling.
Boredom and loneliness have also been linked to excessive licking.
Stomach conditions
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Veterans often speculate licking objects is a sign of a chronic gastrointestinal distress. This can range from cancer to worms. Licking is believed to be a sign of nausea and attempt to relieve pain.
Other conditions
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The dog may also use licking objects as a form of attention. In the past if your dog has received attention for this behavior then he may resort to those same actions.
There may be a problem with the dogs' teeth or gums, the licking could be an attempt to alleviate any discomfort.
Warning
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If the licking is excessive or constant, it is important to have a veterinarian perform a medical exam to rule out any serious conditions.
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Why Is My Dog Licking the Floor & Rugs?
Many dogs have a tendency to lick, the causes can range from simple to complex. It is important to note when and where the dog begins licking, and share this information with the veterinarian.