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    Even if you keep your dog indoors, it can still catch a case of the fleas. However, there are other places where your dog is more likely to be infested with those pesky insects. Anyone who visits your home and comes in contact with your dog can be a flee carrier. Fleas can hop onto their clothing, which can be transferred into your home. More likely, however, fleas can come into contact with your dog from their trips outdoors. From dog parks to the groomer, anytime your dog is outside is a chance for your dog to be exposed to fleas. Lastly, if you have stray or wild animals roaming around your backyard, this increases the chance of fleas every time you let your dog out. (Source: petMD)