. sledge dogs and sientific researchs is neglecteble!!. the only real sientific aprochs done to the ecstreem fore a 1000.000.000$$ profesional industry is that of greyhounds. Hensh the varius specific divelopt foods and suplemends that are availeble for these dogs. the greyhound and pitbull terrier are related in GENES(interbred). coat type/ coloration , body type ecetera.. Not so with slede dogs