Another recent study found that exposure to dogs or farm animals early in life appears to reduce a child’s risk of developing asthma. Researchers looked at more than one million Swedish children and found that those who grew up with dogs in the home were nearly 15-percent less likely to develop asthma than those not exposed to dogs. Some doctors say that the exposure may be a big part of developing a healthy immune system. Being around that dog probably enhances that child’s interaction with a whole bunch of things that the dog brings into the house, bacteria and a variety of other things that maybe beneficial for stimulating that child’s immune system. The new study also confirmed earlier research showing that children who grow up on farms have lower rates of asthma.