Assertion: border collie's dog | /r/HasProperty | outcrossed to another breed
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Source sentences:
text: Border Collies come in other colours too, but these are not recognised by the Kennel Club and as such they are thought of as being "undesirable" as it would mean a dog has been outcrossed to another breed which could have an adverse effect on their health.
text: It is also worth noting that under the Kennel Club Breed Standard for Border Collies there are very specific colours for the breed and any departure from these colours would be refused registration because a dog would likely have been outcrossed to another breed