What about crossing a Border Collie with a Greyhound?

Each breed has unique form, character, and genetics fixed over long breeding, and mixing two may yield unpredictable quality, which is not responsible. The Greyhound and Border Collie differ in size, muscle, skeleton, and temperament, so their cross may randomly inherit traits with uncoordinated proportions or deformity, and results are unpredictable. Any breeding should have a clear purpose, such as improving health or traits; random mating rarely achieves this and may harm the animals.