Frequency of delusional infestation by proxy and double delusional infestation in veterinary practice: Observational study

Abstract

Background: Nothing is known about the prevalence of delusional infestation in veterinary practice and the consequences for psychiatrists. Aims: We attempted to examine the frequency of delusional infestation among pet owners presenting their animals to veterinary clinics. Method: We conducted a survey among 32 663 veterinary clinicians who were members of the Veterinary Information Network. Results: The respondents had seen 724 suspected cases of delusional infestation by proxy in a pet. The clients were mainly White, female and 30-60 years old. They presented mainly dogs and cats, and the alleged infestation was mainly with arthropods or worms. Also, 252 clients claimed to be affected themselves; we termed this 'double delusional infestation'. Conclusions: Delusional infestation is seen frequently in veterinary practice. Psychiatrists need to be aware that patients may have pets they believe are infested.