Measure the neck, not the old collar. A soft tape is best. If you do not have one, use a piece of string and lay it against a ruler.

How to measure

You should be able to fit two fingers under the tape. If you are between sizes, choose the smaller one. A collar that feels snug on the floor can be too tight after a meal or a long walk, so check it again after the first week.

Dogs

Dog collars

Size	Neck	Width	Best for
S	24–32 cm	15 mm	Small dogs, puppies
M	32–42 cm	20 mm	Medium dogs
L	42–55 cm	25 mm	Large dogs, strong pullers

Cats

Cat collars (breakaway clasp as standard)

Size	Neck	Width	Notes
S	18–24 cm	10–12 mm	Light hardware, breakaway clasp
M	24–30 cm	12 mm	Larger cats, still breakaway

Leash widths

Width	Best for
15 mm	Cats, small dogs, everyday walks
20 mm	Medium dogs, most walks
25 mm	Large dogs, strong pullers

Still unsure? Send the neck measurement and a photo to Contact, and we will tell you which size we would choose.