Believe it or not my oldest golden is the one to do the alerting. My youngest golden has the same play style as the GSD's, because that is what he learned as a puppy. As far as loyalist and stamina I would go with the Rotts , dobes , and pits.
Misty- Samoyed Mix
Tannor- Golden Retriever CGC
Robyn- German Shepherd CGC, TC
Midnite-German Shepherd CGC, TC
Brennan- Golden Retriever CGC