In the UK you can find stocks that are huge. I have just bought a male ridgeback puppy - already at 9 weeks he is so powerful. His father is 29" to the withers and about 60KG. His head is huge with a black muzzle and every muscle ripples and stands out. Great temperament though. Also extremely agile for any dog, let alone one of his enormous size. Holding him was a challenge - I am a strong 20 year old - this dogs strength belies his size immensly - he is much much stronger than he looks - and he looks strong. The mother was over 27" to the withers - and also very muscular and powerful. So you definately can get them big. Cheers.