Handsome! Really neat to see how fast a dobe in the wild can muscle up just naturally with great exercise and chow.
Have you got a pedigree by registration, or by DNA that shows the breeder line/geographic area of origin?
How big was Rollo's sire?
What do you feed?
I do have his pedigree, however, since the breeder chooses not to publicly disclose their pedigrees I am inclined to respect that and not post his pedigree in a public forum.
All origin goes back to Germany, so I don't think that's what you mean. He has South American, American, and European on top, and American and European on the bottom. I'd say the most influential (phenotype) comes from his grand dam, and her euro lines, her sire is Pride of Russia Altay. Not sure what Rollo's sire weighs, the breeder did say that Rollo should mature to 100+.
Note: with all the finger pointing at Pride of Russia kennel, and the hate for Sidor specifically as if he were the cause of DCM in the breed, I'll just say, yes, he has Sidor in his pedigree more than once and leave it at that.
Currently, dogs get blueberries, sea lettuce, fish, eggs, chicken, venison, beef, beef heart, and beef liver twice daily, plus Purina Pro Plan Sport 30/20 available at will.