i have a pure bred rotty female and a male rotty/sheperd mix.the mixed dog has a purebred sheperd for his mom and purebred rotty as his dad

F1 = 1st generation puppy - 50% purebred-A and 50% purebred-B - for example, a Golden Retriever to Poodle cross, this is first generation, resulting in healthier offspring. In this particular Goldendoodle cross hair type can be smooth like a Golden, wirey look like a Irish wolfhound or Wavy/shaggy, they can shed or not shed, pups in the same litter can vary. This is not the best cross for people with severe allergies.F1b = backcross puppy - 25% purebred-A and 75% purebred-B. For example, an F1 Goldendoodle and Poodle cross; this is Goldendoodle bred back to Poodle, Wavy Curly shaggy look doodle very consistent in coat types. F1b is the MOST likely of any to be non shedding and allergy friendly then ANY doodles (poodle crosses) and is the easiest coat to take care of.F2 = second generation puppy - F1 hybrid crossed with an F1 hybrid - for example, an F1 Goldendoodle crossed with an F1 Goldendoodle. This combination you get the same percentage of purebred-A as purebred-B as you would an F1 hybrid. In the case of the Goldendoodle, they are more likely to shed.F2b = second generation backcross puppy = F1 bred to a F1b (hybrid backcross)F3 = F2 hybrid to F2 hybridMulti-generation = F3 or higher generation hybrid crossed with F3 or higher generation hybrid

The mixing a full bred rott and 1/2 rott with sheperd mix gives the future puppies dominant genes from the rott. It has 3/4 rott in it and 1/4 sheperd....so maybe down the road, you'd see a puppy showing shepard traits.....but the rotts dominant genes will supercede....I hope this makes sense