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Background:  Guam, a United States of America (USA) island territory in the Pacific Ocean, is known to have large populations of ticks; however, it is unclear what the risk is to wildlife and humans living on the island. Dog ( Canis familiaris ), cat ( Felis catus ), and wild pig ( Sus scrofa ) sentinels were examined for ticks, and environmental sampling was conducted to determine the ticks present in Guam and the prevalence of tick-borne pathogens in hosts.   Methods and Results:  From March 2019-November 2020, ticks were collected from environmental sampling, dogs, cats, and wild pigs. Blood samples were also taken from a subset of animals. A total of 99 ticks were collected from 27 environmental samples and all were  Rhipicephalus sanguineus , the brown dog tick. Most ticks were collected during the dry season with an overall sampling success rate of 63% (95% CI: 42.4–80.6). 6,614 dogs were examined, and 12.6% (95% CI: 11.8–13.4) were infested with at least one tick. One thousand one hundred twelve cats were examined, and six (0.54%; 95% CI: 0.20–1.1) were found with ticks. Sixty-four wild pigs were examined and 17.2% (95% CI: 9.5–27.8) had ticks. In total, 1,956 ticks were collected and 97.4% of ticks were  R. sanguineus . A subset of  R. sanguineus  were determined to be the tropical lineage. The other tick species found were  Rhipicephalus microplus  (0.77%),  Amblyomma breviscutatum  (0.77 %), and a  Haemaphysalis  sp. (0.51%). Blood samples from 136 dogs, four cats, and 64 wild pigs were tested using polymerase chain reaction (PCR) and DNA sequencing methods. Five different tick-borne pathogens with the following prevalences were found in dogs:  Anaplasma phagocytophilum  5.9% (95% CI: 2.6–11.3);  Anaplasma platys  19.1% (95% CI: 12.9–26.7);  Babesia canis vogeli  8.8% (95% CI: 4.6–14.9);  Ehrlichia canis  12.5% (95% CI: 7.5–19.3);  Hepatozoon canis  14.7% (95% CI: 9.2–28.8).  E. canis  was detected in one cat, and no tick-borne pathogens were detected in wild pigs. Overall, 43.4% (95% CI: 34.9–52.1) of dogs had at least one tick-borne pathogen. Serological testing for antibodies against  Ehrlichia  spp. and  Anaplasma  spp. showed prevalences of 14.7% (95% CI: 9.2–28.8) and 31.6% (95% CI: 23.9–40), respectively.   Conclusion:  Four different tick species were found in Guam to include a  Haemaphysalis  sp., which is a previously unreported genus for Guam. Dogs with ticks have a high prevalence of tick-borne pathogens which makes them useful sentinels.

Ticks and Tick-Borne Pathogens in Domestic Animals, Wild Pigs, and Off-Host Environmental Sampling in Guam, USA