It could indeed be a reaction to spotting a cat outside. Actually this is a cross between a medical and behavioral issue. Sometimes meds will work to help a cat "unlearn" fear.

Ask if your vet knows of a local animal behaviorist in your area.

Here is an animal behavior hot-line in San Francisco:

Animal Behavior Hotline - San Francisco S. P. C. A.
415/554-3075
Consultation is free, except for applicable long distance charges. When a counselor retruns call, charges will be reversed. Offers behavior information for dogs and cats. Hours: Messages can be left anytime; calls returned within 24 hours.
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Smile, it will make them wonder what you are up to!

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