The intelligence levels of working dogs is shooting down due to selective breeding by their owners.
Scientists in Sweden have found evidence that the breeding of pedigree dogs for appearance has led to a dramatic decline in the animals? intelligence.
The author of the report, Kenth Svartberg, from Stockholm University, tested 13,000 dogs across 31 different breeds on various characteristics.
He said: ?Modern breeding practices are affecting the behaviour and mental abilities of pedigree breeds as well as their physical features.?
The worst affected working breeds are smooth collies and Rhodesian ridgebacks.
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