Breeding practices have emphasized features like excessive wrinkling and shorter muzzles, which can limit the range of facial expressions in dogs.
Domestication and breeding by humans has affected dogs' abilities to use facial expressions to convey their emotions, a study has found.Researchers at Durham University discovered that modern dogs are not as adept at distinguishing between friendliness and fear as their wolf ancestors were.
It is also problematic for dogs because they are a highly social species. If a dog misinterpreted fear in another dog, it could increase the risk of a fight.For example, wolves wrinkle their noses and raise their upper lip around 80 percent of the time when they are experiencing anger. However, domestic dogs—across all breed-types—only use this movement 34 percent of time in the same context.
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