Individual Signatures Define Canine Skin Microbiota Composition and VariabilityOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers characterized skin microbiota composition in nine healthy dogs from three breeds: French Bulldogs, German Shepherds, and West Highland White Terriers. They sampled eight skin sites per dog, including chin, inner pinna, nasal skin, axilla, back, abdomen, interdigital area, and perianal region.
How was it studied?
The team sequenced the 16S rRNA gene V1-V2 hypervariable regions from 72 skin swab samples using an Ion Torrent platform. They analyzed 2,092 bacterial OTUs across 20 phyla and used UniFrac distance metrics, ANOSIM, and adonis tests to compare individual, breed, and skin site effects.
What did they find?
Proteobacteria, Firmicutes, Fusobacteria, Actinobacteria, and Bacteroidetes dominated dog skin, but relative abundances varied widely by dog. The individual explained 45% of compositional distances among samples, versus 19% for skin site and 9% for breed. Inner pinna had the highest diversity (average 610.82 observed species), while the perianal region had the lowest diversity (323.1 observed species) and the most distinct profile, dominated by Bacteroidetes rather than the usually prevalent Proteobacteria.
Why it matters
The findings suggest each dog carries a distinct, individual-specific skin microbiota signature driven mainly by low-abundance species, rather than a uniform breed or site-based pattern. The authors propose that studies of canine skin disease should compare affected versus unaffected regions within the same dog rather than across different dogs.