Why desert ticks are indoor ticks
a tick sitting on a grass stem loses water constantly. In a place with 47 inches of rain that is manageable, and in a place with 9 inches it is not. El Paso's 42 percent average humidity and 95-degree summer highs put the classic questing strategy out of reach for most species. The brown dog tick solved this by moving indoors. It feeds on dogs at every life stage and shelters in the dry, stable cracks of a building between meals. A house is effectively its habitat, and a house in El Paso is no drier than a house in Ohio. That one fact reorders everything. There is no seasonal window to plan around, because interiors do not have seasons. There is no wooded edge to treat, because the population is in the walls and the crate. And a general yard application, which is what most people buy first, treats ground that was never involved. If you take one thing from this page, it is that the location of your finds tells you the species, and the species tells you where the money should go.
How a brown dog tick problem builds
These infestations tend to start quietly and then look sudden. A dog picks up a few ticks, often from a neighboring animal or from a shaded spot along a wall where another dog rested. Fed females drop off indoors and lay eggs in a crack. Weeks later, larvae hatch and feed on the same dog. They drop, molt, and feed again as nymphs. Each round multiplies the population, and each round happens out of sight in trim gaps, under crate liners, and behind baseboards. The moment people notice is usually when ticks start climbing walls. Brown dog ticks move upward looking for hosts, so finds along door frames and near ceiling corners are a sign the population has grown past the pet. By then the problem is structural. A single application will kill what is exposed and miss the eggs, which is why professional plans use several visits over weeks. The outcome depends on doing three things at once: treat the building, treat the dogs through a veterinarian, and remove the bedding and clutter that holds eggs. Leave out any one and the cycle restarts.
Elevation, wood ticks, and where the city sits
There is one outdoor tick worth knowing about around El Paso, and it lives above town rather than in it. Rocky Mountain wood ticks occupy elevations from 4,000 to 10,500 feet. The city itself sits at 3,740 feet, just under that band, while the higher ground nearby falls inside it. That geography turns tick exposure into a trip-planning question rather than a yard question. A weekend hiking upslope in spring carries different risk than a Saturday in the back yard, and the response is different too: long pants, staying toward the middle of trails, and a careful check afterward at the sock line, waistband, and hairline. Dogs coming along on those trips deserve the same attention, with a hands-on pass over ears, collar line, armpits, and toes before they get back into a vehicle. None of this changes what happens at home. ticks brought down from elevation are travelers, and they do not establish in El Paso's dry outdoor conditions the way brown dog ticks establish inside a structure.
Dogs, neighbors, and free-roaming animals
CDC has connected Rocky Mountain spotted fever cases in Arizona to brown dog ticks living on free-roaming dogs around homes. That finding comes from a desert setting much like this one, and it explains why a household can do everything right and still keep getting ticks. If dogs that nobody is treating are resting against your block wall, sheltering under a porch, or moving through the yard, they are a continuing source. Treating your own house without addressing that route leaves an open supply line. What you can do: keep your own animals on veterinary products year round, block access to the shaded gaps along walls and under porches where animals lie down, and keep food and water out of the yard so there is no reason to linger. In a neighborhood where this is a shared problem, coordinating with neighbors matters more than any product. Several treated houses in a row hold, while one treated house surrounded by untreated dogs usually does not. Bring this up with any provider you hire, since it changes how they plan the exterior portion of the work.
What to ask before hiring for an indoor job
Interior tick work is a different purchase from a lawn service, and the questions should reflect that. Start with the species. Ask what they believe you have and what evidence supports it. A company that examines a specimen or looks at where finds occurred is thinking correctly. One that quotes an exterior package without asking where the ticks were is not. Ask how many visits the price covers and over what period. Because eggs hatch after the first round, a single-visit quote is almost always too optimistic. Ask what preparation they need from you: laundering bedding hot, clearing clutter from along walls, vacuuming cracks, moving crates. Good preparation reduces the number of return visits. Ask about the animals. A provider who tells you to involve a veterinarian is describing the plan that actually works. Ask for the product name and the re-entry interval for children and pets, and look the label up through the EPA pesticide program if you want to read it yourself. Finally, ask what happens if ticks reappear after the last visit, and get that answer in writing.