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The Kennel Club recognises the Parson Russell Terrier which is similar in appearance but slightly larger than the Jack Russell. However, the name Jack Russell is applied to a number of different types of similar small terriers, but due to the diversity amongst these types it has proved difficult to come up with a single breed standard.

Accordingly, the Jack Russell is not registered on the Kennel Club Breed Register, but can be registered on the Kennel Club Activities or Companion Registers.

Last updated - November 2013