Well no one can really tell what the temperment of a mixed breed dog is going to be. Your best guess would be to look at the two breeds and then you would know that you could get any combination of the traits from the dogs.
Border Collie--The Border Collie is energetic, intelligent, keen, alert, and responsive.
An intense worker of great tractability, it is affectionate towards friends
but may be sensibly reserved towards strangers. When approached, the Border
Collie should stand its ground. It should be alert and interested, never
showing fear, dullness or resentment. Any tendencies toward viciousness,
nervousness or shyness are very serious faults.--AKC
Rottweiler--The Rottweiler is basically
a calm, confident and courageous dog with a self-assured aloofness that does not
lend itself to immediate and indiscriminate friendships. A Rottweiler is self-confident
and responds quietly and with a wait-and-see attitude to influences in his environment.
He has an inherent desire to protect home and family, and is an intelligent dog
of extreme hardness and adaptability with a strong willingness to work, making
him especially suited as a companion, guardian and general all-purpose dog.
The behavior of the Rottweiler in the show ring should be controlled, willing
and adaptable, trained to submit to examination of mouth, testicles, etc. An aloof
or reserved dog should not be penalized, as this reflects the accepted character
of the breed. An aggressive or belligerent attitude towards other dogs should
not be faulted.
A judge shall excuse from the ring any shy Rottweiler. A
dog shall be judged fundamentally shy if, refusing to stand for examination, it
shrinks away from the judge. A dog that in the opinion of the judge menaces or
threatens him/her, or exhibits any sign that it may not be safely approached or
examined by the judge in the normal manner, shall be excused from the ring. A
dog that in the opinion of the judge attacks any person in the ring shall be disqualified.--AKC
Border Collie--The Border Collie is energetic, intelligent, keen, alert, and responsive.
An intense worker of great tractability, it is affectionate towards friends
but may be sensibly reserved towards strangers. When approached, the Border
Collie should stand its ground. It should be alert and interested, never
showing fear, dullness or resentment. Any tendencies toward viciousness,
nervousness or shyness are very serious faults.--AKC
Rottweiler--The Rottweiler is basically
a calm, confident and courageous dog with a self-assured aloofness that does not
lend itself to immediate and indiscriminate friendships. A Rottweiler is self-confident
and responds quietly and with a wait-and-see attitude to influences in his environment.
He has an inherent desire to protect home and family, and is an intelligent dog
of extreme hardness and adaptability with a strong willingness to work, making
him especially suited as a companion, guardian and general all-purpose dog.
The behavior of the Rottweiler in the show ring should be controlled, willing
and adaptable, trained to submit to examination of mouth, testicles, etc. An aloof
or reserved dog should not be penalized, as this reflects the accepted character
of the breed. An aggressive or belligerent attitude towards other dogs should
not be faulted.
A judge shall excuse from the ring any shy Rottweiler. A
dog shall be judged fundamentally shy if, refusing to stand for examination, it
shrinks away from the judge. A dog that in the opinion of the judge menaces or
threatens him/her, or exhibits any sign that it may not be safely approached or
examined by the judge in the normal manner, shall be excused from the ring. A
dog that in the opinion of the judge attacks any person in the ring shall be disqualified.--AKC
