Take your older dog for a couple of long walks each day (40 min - 1 hr), briskly nmarching, not stopping and sniffing.
Then take both for a few short walks together, not letting either one get ahead of you.
Keep a leash on older dog when he is around younger one, until he is trustworthy. Usually there are signs that a bite/attack is coming, or situations that trigger it. Is puppy trying to take his toys, bed, or get attention from you? Is your dog jealous if puppy approaches while you are patting older dog?
Make sure you aren't holding dogs so they have to stand face to face. Very disrespectful to be stared at in dog language, and that position forces them to do that.
The main key will be tiring out your older one. Excess energy leads to anxiety/aggression.
Don't ever leave them alone together until they are 100% trustworthy.
Then take both for a few short walks together, not letting either one get ahead of you.
Keep a leash on older dog when he is around younger one, until he is trustworthy. Usually there are signs that a bite/attack is coming, or situations that trigger it. Is puppy trying to take his toys, bed, or get attention from you? Is your dog jealous if puppy approaches while you are patting older dog?
Make sure you aren't holding dogs so they have to stand face to face. Very disrespectful to be stared at in dog language, and that position forces them to do that.
The main key will be tiring out your older one. Excess energy leads to anxiety/aggression.
Don't ever leave them alone together until they are 100% trustworthy.