People seem to be handing out too many treats to their cats and dogs, as there are growing signs that household pets are getting a bit chubby these days.

Veterinarians report that 30 percent of the cats and dogs they treat are overweight. Pet-food maker Iams Japan says 14 percent of cat owners and 25 percent of dog owners think their pets are plump.

One reason for the proliferation of fat pets is that many are kept inside and not allowed out. Experts say house-bound pets tend to suffer from a lack of exercise and get fed more because they spend more time with their owners.