Successful Treatment of Trichodectes canis in a Dog with a 1-Month Formulation of Fluralaner.

An 11 yr old, 8.16 kg, spayed female Lhasa apso with unresolved pruritus was presented to the dermatology service. On physical examination, infestation of biting lice (Trichodectes canis) was discovered. The dog was treated with one dose of 100 mg fluralaner and re-evaluated at 2 and 4 wk following administration. After 2 wk, all adult lice were eliminated; however, nits were still present. After 4 wk, all clinical signs and all evidence of lice infestation were resolved. This case indicates that fluralaner is an effective treatment for biting lice, even at the lower dosage used in the 1 mo formulation.