Even if your dog stays close to home, fleas and ticks are canny creatures, and they have ways of making it into your home and onto your pets, even with preventions in place. All it takes is a few fleas to get established in your yard to set up a full-scale infestation of your yard, your pet, and your home.
Unfortunately, there is no way to keep every wild animal out of your yard -- not even with a tall fence. No yard is an island unto itself, and squirrels, raccoons, and other small rodents will find ways to get into your yard, carrying fleas and ticks along with them.
The more visitors you have to your yard, the greater the chance of an infestation arriving on the back of another animal. Feral cats roaming your property are also carriers of fleas and ticks. This is one reason not to encourage wild animals to come into your dog’s domain by leaving out offerings such as corn, nuts, and seeds. Even a bowl of water, left out for when your dog is outside, is an invitation for other animals to hang about.
You and your human visitors can also be unwitting carriers of fleas and ticks. Anyone coming into your home could be a carrier of fleas. They can be brought in from the person’s own home or pet without their knowledge.
If you like to spend time hiking in areas where fleas and ticks are prevalent, it’s easy for a few to hitch a ride on your pants leg, socks, shoes, etc. These parasites are well-adapted at finding ways to attach to potential hosts in order to find their next blood meal.
OUTSIDE THE HOME
Anytime your pet goes out into the world -- even if only for short walks around the block; play dates at the local dog park; a visit to the veterinarian; a stint at the boarding kennel; a trip to the groomer; a ride in the car; etc. -- she is being exposed to the opportunity for fleas and ticks to hop aboard.
You may be very careful about checking your dog for ticks after a good hike in the woods or a trip down to the lake, but ticks (and fleas) are good at hiding and they will find the furriest spots in the deepest crevices of your pet’s skin. Look especially close in the neck fur, in the abdomen, and in the arm "pits."