Children run less risk of being sensitive to allergens if there is a dog in the house in the early years of their lives, scientists have found.
The conclusion, based on a six-year study of 9,000 children, adds weight to the theory that growing up with a pet trains the immune system to be less sensitive to potential triggers for allergies such as asthma, eczema and hay fever.
The “hygiene theory” of allergy holds that modern life has simply become too clean, meaning that babies’ immune systems are not exposed to enough germs to develop normally.
Having a dog provides enough dirt of the right kind, the new German study suggests. But it may be important that baby meets dog early enough to affect the immune system as it develops. “Our results show clearly that the presence of a dog in the home during subjects’ infancy is associated with a significantly low level of sensitisation to pollens and inhaled allergens,” said Joachim Heinrich of the National Research Centre for Environmental Health in Munich.
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