X Small

Up to 20-25 cm in length

Breeds: Cats ,Chihuahua, Terrier, Maltese etc.  ( not including the tie )

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Up to 25-30 cm in length

Breeds: Mini Australian Shepherd, Pug,  Corgi  etc. ( not including the tie ) 

Collar - 16 inch - 12 inch adjustable 

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Small

Up to 30-35 cm in length

Breeds: Cocker spaniel, bulldog, Beagle  etc.

( not including the tie )

Collar - 20 inch - 16 inch adjustable 

Medium

Up to 35-40 cm in length

Breeds: Labrador, Golden Retriever etc. 

( not including the tie )

Collar - 24 inch - 20 inch

Large

( When you buy a over-collar I recommend getting one size down)