Werneckiella equi is an ectoparasite of equids, and control can be challenging because of the limited availability of licensed products. This case report describes the clinical observation of 1% fipronil pour-on against W. equi infestation in horses admitted to a veterinary hospital. Two horses were treated and observed between 2022 and 2023. Both exhibited pruritus, especially in the head, withers, and croup regions, and were diagnosed with severe W. equi infestation. The treatment consisted of a single topical application of 1% fipronil pour-on (1 mg/kg). Parasite reduction was assessed by complete physical examination, until complete parasite elimination. Demarcated areas were used for daily lice counts. Infestation was resolved within eight days (Horse 1) and twelve days (Horse 2), with no recurrence observed over six months. These preliminary observations suggest that 1% fipronil pour-on may offer a practical alternative for eliminating W. equi under clinical conditions, offering advantages such as minimized stress during application, precise dosing, and enhanced handler safety. However, due to the lack of a control group and small sample size, these results should be interpreted as preliminary clinical evidence.

Rectal amputation is a surgical approach indicated for the management of severe rectal lacerations or extensive rectal prolapse when transmural compromise or primary repair is unfeasible. These conditions, although uncommon, present substantial challenges in equine practice due to the anatomical complexity of the pelvic region and the potential for life-threatening complications if not adequately addressed. This study aimed to describe and standardize a reproducible surgical technique for rectal amputation in horse cadavers. Six equine cadavers (mean body mass, 441.83± 66.84 kg) were positioned in lateral recumbency, the anus was everted with simple interrupted sutures, and a circumferential incision was made around the anal sphincter. Perirectal tissue was dissected to expose the rectum, which was transected in quadrants to facilitate controlled removal, followed by immediate apposition of the mucosal, submucosal, and muscular layers to the remaining anal margin using interrupted sutures. Temporary eversion sutures were removed after completion of the anastomosis. The mean resected rectal length was 26.5 ± 4.46 cm (range, 21-31 cm), and the mean surgical time was 144.66 ± 32.64 min (range, 98-193 min). The technique was anatomically feasible and technically reproducible, providing a standardized approach that may assist in the surgical management of complex rectal disorders in horses.