It’s ideal to start when the pets are young. But regardless of age, you need a plan (and patience) to create a successful union.

By Susan Easterly

Chester, a senior, orange-and-white polydactyl cat who lives with Pamela Perry, DVM, was only six weeks old when he met his first dog, a 50-pound collie mix named Earl. The two quickly became best friends. Thanks to Earl, Chester has never been afraid of dogs during his long life (he’s nearly 18 years old), but wisely gives them plenty of room — or keeps a safe distance — if he doesn’t know them well.

Most cats and dogs can learn to tolerate each other. But there are some that will never be able to get along.

Cats and dogs are very different creatures, but they aren’t natural enemies. “Most cats and dogs learn to tolerate each other,” says Dr. Perry, a board-certified animal behaviorist at the Cornell University Hospital for Animals. “Some turn…

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