Short answer: go slowly, at the cat's pace, and keep both pets safe. Dogs Trust says to introduce them gradually over a few weeks.
PDSA says to set up separate safe spaces for both pets, where they can go without being disturbed by the other. In an ideal world, give them a few days to get used to each other's scent first. You can swap blankets, or rub a soft cloth around the cat's cheeks and under the dog's armpit and give each pet the other's cloth.
PDSA says to keep a barrier, such as a baby gate, so they can see and smell each other and still feel safe. Keep your dog on the leash at first and watch for over-excitement or lunging. When both seem calm, you can take the leash off but keep the gate.
Dogs Trust suggests putting the cat's food behind a door, a barrier or somewhere high that the cat can reach. See a dog who chases the cat and a puppy meeting a cat.
If your dog will not calm down around the cat, ask a qualified trainer for help. Dogs Trust also suggests a vet visit to rule out medical causes.
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