Country Brook Petz Premium Nylon Dog Collar

Target

Dark brown color matches exactly, Flat collar design matches, Material (nylon webbing) is consistent with the visual texture in the frame, Standard collar width appears consistent, Buckle type is plausible given the limited visibility

Buckle Collars

Harbor Hound Co.

Dark brown color matches exactly, Flat collar design matches, Leather material (implied by appearance and common for this style) matches, Metal buckle (brass) is consistent with general appearance in frame, Simple, unadorned design aligns with source

BioThane Dog Collar Waterproof Espresso Brown Vivid Canine

Vivid Canine

Espresso brown color matches 'Dark Brown', Flat collar design matches