Why does my dog's gas smell so bad?
Most cases of chronic flatulence are caused by a diet that is poorly digested by the dog.
These poorly digestible diets cause excessive fermentation in the colon and subsequent gas formation.
Soybeans, peas, beans, milk products, high-fat diets and spicy foods are all commonly associated with flatulence in dogs.
Many believe it's instinctual behavior, harkening back to the days when your dog's wild ancestors would mask their scent to help them sneak up on their prey.
Wolves, for example, have been observed rolling in animal carcasses or the droppings of plant-eating animals, to cover up their own smell during the hunt.
Dogs also lick because they like the taste of an owner's salty skin and out of habit.
Mostly, with domestic Dogs, it's a sign of affection.
Licking releases pleasurable endorphins which gives Dogs a feeling of comfort and pleasure — like the feeling people get when they are biting their nails — it relieves stress.
And grass-eating doesn't usually lead to throwing up - less than 25% of dogs that eat grass vomit regularly after grazing.
Other suggested reasons why your dog might be eating grass include improving digestion, treating intestinal worms, or fulfilling some unmet nutritional need, including the need for fiber.