So why cross breed? Are The puppies healthier? The percentage of cross breed dogs with genetic problems is MUCH lower than purebred dogs because the gene pool is mixed. We breed purebred to purebred creating a first generation hybrid because we believe in the hetaerists effect and hybrid vigor. Vigor means, "Physical or mental strength, energy, or force."

 

To help you understand the concept we here is an example:

 In general we will call the first purebred "purebred-A", and the second "purebred-B".

F1 = 1st generation puppy - 50% purebred-A and 50% purebred-B - for example, a Yorkie to Chihuahua this is first generation, resulting in healthier offspring