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- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD