OAKLAND, Calif., May 31 — For Mary Kalin-Casey, it was never about her cat.

Ms. Kalin-Casey, who manages an apartment building here with her husband, John Casey, was a bit shaken when she tried a new feature in Google’s map service called Street View. She typed in her address and the screen showed a street-level view of her building. As she zoomed in, she could see Monty, her cat, sitting on a perch in the living room window of her second-floor apartment.

“The issue that I have ultimately is about where you draw the line between taking public photos and zooming in on people’s lives,” Ms. Kalin-Casey said in an interview Thursday on the front steps of the building. “The next step might be seeing books on my shelf. If the government was doing this, people would be outraged.”

Her husband quickly added, “It’s like peeping.”

Ms. Kalin-Casey first shared her concerns about the service in an e-mail message to the blog Boing Boing on Wednesday. Since then, the Web has been buzzing about the privacy implications of Street View — with varying degrees of seriousness. Several sites have been asking users to submit interesting images captured by the Google service, which offers panoramic views of miles of streets around San Francisco, New York, Las Vegas, Miami and Denver.

On a Wired magazine blog, for instance, readers can vote on the “Best Urban Images” that others find in Street View. On Thursday afternoon, a picture of two young women sunbathing in their bikinis on the Stanford campus in Palo Alto, Calif., ranked near the top. Another showed a man scaling the front gate of an apartment building in San Francisco. The caption read, “Is he breaking in or has he just locked himself out?”