Study supports shorter chlorhexidine shampoo contact time in dogs

A new open-access study in Veterinary Dermatology evaluated a 3% chlorhexidine/ophytrium shampoo and mousse in 18 healthy dogs and found that both formulations inhibited growth of common canine bacterial and fungal pathogens in vitro, including methicillin-susceptible and methicillin-resistant Staphylococcus pseudintermedius, E. coli, ESBL-producing E. coli, Pseudomonas aeruginosa, and Malassezia pachydermatis. The shampoo’s antimicrobial activity after a 3-minute contact time was non-inferior to 10 minutes, and the leave-on mousse showed residual activity for at least four days against most tested organisms. The products studied align with Ceva’s DOUXO S3 PYO formulation, which is labeled with 3% chlorhexidine digluconate and 0.5% ophytrium. (researchgate.net)

Why it matters: For veterinary teams managing canine pyoderma and skin dysbiosis, the study adds bench evidence supporting shorter shampoo contact times and the potential value of leave-on antiseptic therapy between baths. That matters because current ISCAID guidance says topical antimicrobial therapy alone is the treatment of choice for surface and superficial pyodermas, and notes that 2% to 4% chlorhexidine products have the strongest clinical support. In practice, anything that may improve pet parent adherence without sacrificing activity could help reduce reliance on systemic antimicrobials. (amrvetcollective.com)

What to watch: The next question is whether these in vitro findings translate into better real-world adherence, lesion resolution, and antimicrobial stewardship outcomes in dogs with active disease. (researchgate.net)