How to Introduce a Cat to Dog. How do you introduce two animals that are already very friendly with each other? Here are some tips for introducing your cat or dog into the home of another animal who feels at least somewhat territorial – particularly if this is your first time having pets together. The most important thing to remember when introducing cats and dogs is patience. Most owners have the experience of being teased by their pet, so be careful how you handle introductions. You can use treats or simply let them sniff each other without touching, but don’t reach out! If one animal gets too riled up it doesn’t mean they won’t get along in time, but it might take more work on both sides to get there.