If possible, it's best to introduce animals when they are both young. If one or both of the animals are older, you may need to proceed with more caution to help prevent aggressive behavior. 

Introduce them slowly. It's often recommended to keep them in separate rooms that share a door or other safe barrier for some time so that they can become acquainted with each other's smells. This helps reduce a sense of panic or shock when they meet face to face for thr first time because they will have some sense of familiarity with each other.

When they are eventually introduced without a barrier, keep them restrained in some way, perhaps by holding them in your arms or with a leash. Watch for any aggressive/defensive behavior or posturing in either animal to help you determine the pace that you can progress the introductions.

Provide positive reinforcement with treats or pets when the animals are showing signs of indifference or friendliness around each other. Avoid punishment, such as spanking, when the animals are near each other, as they may associate the presence of the other animals with the punishment.
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