Direct Encounter

The direct encounter is quite a risky one, majorly because of the unpredictability. However, many owners adopt this method because it allows them to understand how one pet perceives the other instantly. One person has to hold the dog, and one has to bear the cat and let them come face to face. Make sure that you notice their instincts throughout the process. If the cat is not hissing, it is okay with the dog around, and if the dog doesn’t attempt to chase the cat the dog is okay with the cat’s presence. If they behave positively and desirably, make sure that you immediately reward them so that they slowly adopt the behavior.
General Conditioning

If the above two methods seem to be failing, you should try conditioning your pets into ignoring each other’s presence and simply co-existing without creating any conflict. For this, you can play the game called “Look at that,” wherein you teach your pets to look at each other at first and then immediately look away for a treat. Doing so will teach them that not looking or engaging with each other is more rewarded. Playing this game regularly will condition their minds and cause them to stick to this “good behavior” in the longer run. After the other two methods, this is the most effective one.
CONCLUSION
One of these three methods will most likely make your pets feel comfortable around each other, provided you give them enough time and treats. Time and patience are key when you are introducing your animals to each other. It is also crucial to maintain positive interactions for both pets. They will get along eventually after they spend enough time together.