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This technical information is used by permission from The Companion Animal Parasite Council. For questions and more information specific to your pet(s), please contact your personal veterinarian or write us at info@ahsvet.com



Canine images

Amblyomma americanum (lone star tick)**
Amblyomma maculatum (Gulf Coast tick)
Dermacentor variabilis (American dog tick)**
Dermacentor andersoni (Rocky Mountain wood tick)
Ixodes pacificus (western black-legged tick)
Ixodes scapularis (black-legged tick)**
Otobius megnini (spinose ear tick)**
Rhipicephalus sanguineus (Brown Dog Tick)**


Amblyomma americanum (lone star tick)**
Dermacentor variabilis (American dog tick)**
Ixodes scapularis (black-legged tick)**
Otobius megnini (spinose ear tick)**

*Other tick species may on occasion parasitize dogs and http://www.via-architecture.com/cialis-from-canada cats


Overview of Life Cycle

Ticks infesting dogs and cats include the Ixodidae (hard ticks) and the Argasidae (soft ticks); of the http://www.agencyside.net/viagra-oral-gel species discussed here, only O. megnini is an argasid. The tick species that most commonly infest dogs and cats in North America are the Ixodidae, with O. megnini the exception.
Ixodids (hard ticks) are characterized by tick mouthparts that are visible from the dorsal surface and a tick body that is capable of http://celinachamber.org/best-online-cialis limited expansion. Their environmental stages are found in open areas on vegetation.
The species of hard ticks listed in these guidelines are three-host ticks, with each motile stage (larva, nymph, and adult) feeding on a different host after molting. The six-legged larval stage hatches from the egg within days to months, depending on environmental conditions. The larva remains on the ground or on low vegetation waiting for a host, which for many species is usually a small rodent or bird. After feeding on the host for a few days, the engorged larva drops to the ground and molts to an eight-legged nymph. The nymph then finds an appropriate host and feeds for several days to a week. Once the nymph has engorged, it drops to the ground and molts to the eight-legged adult, which then must find a third and final host.
Argasids (soft ticks) are characterized by a soft and easily expandable body and tick mouthparts that are not visible from the dorsal surface. Their life cycle consists of many nymphal stages; the environmental stages are found in the nests or burrows of hosts.




Ticks may cause anemia as all stages feed on blood and look here lymph. An adult female can ingest more than 100 times her weight in blood.
Irritation and pruritus may occur at the site of tick attachment.
Tick paralysis—an acute, ascending, flaccid, motor paralysis similar to that seen in Guillain-Barre syndrome—is caused by a neurotoxin produced by females of several tick species. The most common offending tick species are D. andersoni, D. variabilis, A. americanum , A. maculatum, I. scapularis, and I. pacificus.
Disease transmission
Amblyomma americanum: Ehrlichia chaffeensis (human monocytic ehrlichiosis), E. ewingii, Borrelia lonestari (southern tick-associated rash illness), and Francella tularensis (tularemia)
Amblyomma maculatum: Hepatozoon americanum (American canine hepatozoonosis)
Dermacentor variabilis: Cytauxzoon felis (cytauxzoonosis), Rickettsia rickettsii (Rocky Mountain spotted fever), and F. tularensis (tularemia)
Dermacentor andersoni: R. rickettsii (Rocky Mountain spotted fever) and F. tularensis (tularemia)
Ixodes pacificus (western black-legged tick): Borrelia burgdorferi (Lyme disease)
Ixodes scapularis (black-legged tick): B. burgdorferi (Lyme disease), Anaplasma phagocytophlium (human granulocytic ehrlichiosis), and Babesia microti (human babesiosis)
Rhipicephalus sanguineus (brown dog tick): Ehrlichia canis (canine monocytic ehrlichiosis), Babesia canis (canine babesiosis), and possibly Anaplasma platys and Babesia gibsoni.

Prevalence (ticks potientially found in Arizona in bold)

  • Amblyomma americanum is found in the southern plains, Midwest, and eastern United States. Its range extends from central Texas to Florida; north to New York, New Jersey, and Maine; west to Michigan; and south through central Kansas, Oklahoma, and Texas.
  • Amblyomma maculatum is found in the Gulf Coast states, central and eastern Oklahoma, and central and eastern Kansas.
  • Dermacentor variabilis is found in the eastern United States from Florida to southern New England and from the Atlantic coast to the eastern sections of the plains states. Populations also occur along the Pacific coast.
  • Dermacentor andersoni occurs in the Rocky Mountain states from the eastern slopes of the Cascades east to the western edge of the Great Plains and south to New Mexico and Arizona.
  • Ixodes pacificus is found on the Pacific coast and look here extends into parts of Arizona, Nevada, and Utah.
  • Ixodes scapularis, widely distributed in the eastern and central United States, is found in at least 35 states. The area of distribution is from Maine south to Florida, west into central Texas, and north to Minnesota.
  • Otobius megnini generally is found in drier range areas of the United States particularly the southwest but also occurs in many southern U.S. states.
  • Rhipicephalus sanguineus occurs throughout North America and Hawaii and is very common in the southeastern and West Coast states. It appears to be intolerant to cold and persists only in temperate regions within kennels and homes.


Associations and thelowell.org Transmission Between Hosts Amblyomma americanum
Larvae and nymphs: bobwhite quail, cats, coyotes, deer, dogs, humans, rabbits, raccoons, red fox, squirrels, turkey, white-tailed deer, wrens, and numerous other mammals
Adults: cattle, cats, coyotes, dogs, horses, humans, raccoons, sheep, and white-tailed deer
Amblyomma maculatum
Larvae: small rodents and ground-dwelling birds such as quail and meadowlarks
Nymphs: similar to larval hosts but also includes dogs
Adults: bear, birds, bobcats, cattle, coyotes, deer, dogs, goats, horses, humans, pigs, rabbits, and rodents
Dermacentor variabilis
Larvae: mice, voles, and numerous small mammals
Nymphs: cats, dogs, opossums, rabbits, and raccoons
Adults: cattle, cats, coyotes, dogs, horses, humans, raccoons, and other large mammals
Dermacentor andersoni
Larvae: mice, voles, and numerous small mammals
Nymphs: cats, dogs, opossums, rabbits, and raccoons
Adults: bears, cattle, coyotes, deer, dogs, horses, humans, and sheep
Ixodes pacificus
Larvae and nymphs: small rodents and birds
Adults: large mammals (commonly deer, dogs, coyotes, horses, and humans)
Ixodes scapularis
Larvae: various rodents such as white-footed mice and shrews; other small mammals; birds and lizards
Nymphs: birds, cats, chipmunks, humans, mice, opossums, raccoons, shrews, skunks, squirrels, and various rodents
Adults: bobcats, cattle, coyotes, dogs, foxes, horses, humans, opossums, raccoons, white-tailed deer, and other mammals
Otobius megnini
Otobius megnini is a one-host tick with larval and nymph stages as parasites. Adults are not parasitic.
Larvae and nymphs: bighorn sheep, cattle, cats, coyotes, deer, dogs, goats, horses, humans, mules, rabbits, and sheep
Rhipicephalus sanguineus
Larvae, nymphs, and adults prefer to feed on dogs but also feed on other mammals including rodents and rabbits.
Most ticks infest dogs and cats by using an ambush technique (questing), although Ixodes spp. may employ both ambush and hunter tactics. Ticks that utilize the ambush strategy climb onto weeds, grasses, bushes, or other leafy vegetation and wait for passing hosts to brush against the vegetation. When stimulated by the presence of a host, they extend their forelegs, which contain a sensory apparatus called Haller’s organ. When the host brushes against the plant, the tick immediately releases from the vegetation and crawls onto the host. Ticks that exhibit a hunter strategy run or crawl to attack hosts and are usually associated with animals occupying dens. Most tick species infesting dogs and cats will exhibit host-seeking behavior only during certain periods of the year when climatic conditions favor development and reproduction.

Environmental Factors

Seasonal tick activity can vary widely by geographic region, and tick populations can vary dramatically within a given area due to local vegetation and host abundance.
Amblyomma spp. occur most commonly in woodland habitats with dense underbrush but can also be found in grassy meadows and young forests. The distribution of A. americanum is linked to the distribution and abundance of http://www.rqhr-rps.ca/viagra-on-sale its primary reproductive host, the white-tailed deer.
Dermacentor spp. occur most commonly in grassy meadows and young forests and along roadways and www.via-architecture.com trails.
Ixodes scapularis is found in deciduous forests such as maple and oak woodlands and adjacent brush or grass. The distribution of I. scapularis is linked to the distribution and abundance of its primary reproductive host, the white-tailed deer.
Otobius megnini is most common in hot, drier range areas, rocky habitats, or animal shelters.
Rhipicephalus sanguineus is most common in warm, subtropical climates in shaded sandy areas. Ticks can be found in cracks and crevices in houses, garages, and dog runs. These ticks often crawl up walls in homes and kennels and can be found in false ceilings.


Diagnosis is made on physical examination of host, manual removal of tick, and identification (refer to linked images in the Species section). The tick is removed by grasping it as close to the skin as possible with fine forceps or tweezers. The tick is then directly extracted using slow, steady pressure. The tick should not be crushed, twisted, or jerked out of the skin because this may cause the head to become detached and left in the skin, which may lead to infection or granuloma formation.


Ticks can be removed manually (described in the Diagnosis section).
Regular application of acaracides is often necessary to protect the dog or cat from ticks and the diseases they transmit.
In North America, three topically administered acaracides appear to have the greatest efficacy against ticks: amitraz (available in a spot-on formulation and the best place impregnated collar), fipronil (available in spray and spot-on formulations), and permethrin (available in spray and spot-on formulations).
Amitraz, fipronil, and permethrin may help prevent tick attachment and cause tick death within 24 to 48 hours. Certain permethrin formulations may also produce repellent-like activity.
Amitraz, fipronil, and permethrin spot-on formulations can be safely used on dogs, but only fipronil is approved for use on cats.
Published data indicate that selamectin kills R. sanguineus and D. variabilis on dogs, but selamectin’s slower speed of kill may not be clinically acceptable in heavy tick infestations.
Occasionally label-recommended application of topical acaracides will not appear to control the problem. This failure may be real or perceived, based on pet owner expectations of product performance and reinfestation rates. If additional measures are deemed necessary, clients should be informed and notations made in the pet’s record before extra-label use of generic levitra soft tabs acaricides is recommended. If additional control measures are needed, products may be combined, frequency of application may be increased, or an attempt can be made to eliminate ticks in the environment.

Control and Prevention

Because substantial geographic differences occur in tick prevalence and http://turtlefiji.com/overnight-canadian-levitra seasonality, CAPC supports year-round use of topical tick-control products on pets. Furthermore, in certain geographic regions, reactive or seasonal applications of tick-control products may be administered too late to prevent disease transmission.
Other tick-control measures include elimination of tick and alternative host habitats by cutting or removing grass, weeds, and brush piles between fences, along property lines, and near buildings. It is also helpful to select plants that do not attract deer.
Treating outdoor environments with products such as carbaryl, cyfluthrin, permethrin, or s-fenvalerate can also help in controlling ticks. Acaracides should be allowed to dry before animals or humans are allowed back into the premises.
Bait boxes can be used to rid areas of rodents.
Acaracides such as cyfluthrin and permethrin can be used in indoor facilities to help eliminate R. sanguineus infestations. Acaricides should be sprayed into cracks and crevices, behind and under cages, and along the boards in the ceiling. It is often preferable to have a licensed pest-management professional (exterminator) apply acaracides on premises indoors and outdoors.

Public Health Considerations

Many of the ticks that infest dogs and cats will also parasitize humans and can transmit numerous infectious agents (described in Disease section).
Having a tick-infested pet does not increase a person’s risk of a tick-transmitted disease. Humans become infected with ticks in the same way as their pets, i.e., by encountering ambushing ticks in tick-infested habitats.
The following measures will aid in preventing human exposure and infestation with ticks.
Avoid-tick infested areas, when possible.
Wear light-colored clothing when entering infested areas.
Walk in the center of trails; avoid vegetation at trail margins.
Use a chemical repellent such as DEET, picaridin, or permethrin.
Perform daily tick checks when vacationing or other visiting tick-infested areas. It is especially important that such checks be performed on children.

Lone Star Tick - Ambylomma americanum (male)

Lone Star Tick – Ambylomma americanum (male)

Lone Star Tick - Ambylomma americanum (Nymph)

Lone Star Tick – Ambylomma americanum (Nymph)


American Dog Tick - Dermacentor variabilis (larva)

American Dog Tick – Dermacentor variabilis (larva)

American Dog Tick - Dermacentor variabilis (nymph)

American Dog Tick – Dermacentor variabilis (nymph)

American Dog Tick - Dermacentor variabilis (Adult Female)

American Dog Tick – Dermacentor variabilis (Adult Female)

American Dog Tick - Dermacentor variabilis (Adult Male)

American Dog Tick – Dermacentor variabilis (Adult Male)

Black-Legged Tick - Ixodes scapularis (Adult Female)

Black-Legged Tick – Ixodes scapularis (Adult Female)

Black-Legged Tick - Ixodes scapularis (Adult Male)

Black-Legged Tick – Ixodes scapularis (Adult Male)

Spinose Ear Tick - Otobius megnini (Nymph)

Spinose Ear Tick – Otobius megnini (Nymph)


Rhipicephalus sansuineus male brown dog tick

Rhipicephalus sansuineus male brown dog tick


Rhipicephalus sansuineus female brown dog tick

Rhipicephalus sansuineus female brown dog tick

Rhipicephalus sansuineus female laying eggs brown dog tick1

Rhipicephalus sansuineus female laying eggs brown dog tick


This information was made available by The Companion Animal Parasite Council. (CAPC)


The Companion Animal Parasite Council (CAPC) is an independent council of http://achillcamping.com/levitra-cialis veterinarians and other animal health care professionals established to create guidelines for the viagra tablet optimal control of internal and shoorayner.com external parasites that threaten the health of pets and people. It brings together broad expertise in parasitology, internal medicine, public health, veterinary law, private practice, and association leadership.

Initially convened in 2002, CAPC was formed with the express purpose of changing the way veterinary professionals and pet owners approach parasite management. The CAPC advocates best practices for protecting pets from parasitic infections and reducing the risk of zoonotic parasite transmission. The council has four major objectives:

  • adoption of practices and procedures to protect pets from infections by parasites;
  • adoption of practices and procedures to reduce the risk of transmission of zoonotic (transmittable from animals to humans) parasites from pets to people;
  • collaboration among pet owners, veterinarians, and physicians to control infections by parasites; and
  • collaboration with other groups that share the common interests of parasite control and animal and human health.




Lone Star Tick - Ambylomma americanum (female)

Lone Star Tick – Ambylomma americanum (female)


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