There is no genetic engineering allowed, just selected breeding and offspring selection. There is no genome sequencing, imagine medieval technology plus mendelian principles. The laws of heredity are understood quite well, if perhaps not perfectly. The species we can use are those that were present on Earth circa 10,000 BC, so pretty much the same as today. Assume that an effective political or social organization exists that can maintain this breeding focus across the generations needed. The goal is to achieve another human-level intelligent species.

Is it possible to breed another species into intelligence? How long would it likely take?

There is no genetic engineering allowed, just selected breeding and offspring selection. There is no genome sequencing, imagine medieval technology plus mendelian principles. The laws of heredity are understood quite well, if perhaps not perfectly. The species we can use are those that were present on Earth circa 10,000 BC, so pretty much the same as today. Assume that an effective political or social organization exists that can maintain this breeding focus across the generations needed. The goal is to achieve another human-level intelligent species.

Is it possible to breed another species into intelligence? How long would it likely take?