An Israeli city is using DNA analysis of dog droppings to reward and punish pet owners.

Under a six-month trial program launched this week, the city of Petah Tikva, a suburb of Tel Aviv, is asking dog owners to take their animal to a municipal veterinarian, who then swabs its mouth and collects DNA.

The city will use the DNA database it is building to match feces to a registered dog and identify its owner.

Owners who scoop up their dogs’ droppings and place them in specially marked bins on Petah Tikva’s streets will be eligible for rewards of pet food coupons and dog toys.

But droppings found underfoot in the street and matched through the DNA database to a registered pet could earn its owner a municipal fine.

T-Mobile plans to show off the first wireless phone powered by Google Inc.’s much-anticipated Android software system at a Sept. 23 news conference.

Although T-Mobile intends to demonstrate the phone for reporters and analysts invited to next week’s event in New York, the handset isn’t expected to be available in stores until next month.

More specifics about the phone’s shipping date and pricing are still to come. T-Mobile is expected to subsidize part of the phone’s cost for buyers who agree to subscribe to the carrier’s mobile service.

SanDisk Corp. said Tuesday it had rejected a $5.85 billion takeover offer from Samsung Electronics Co. Ltd after its board determined the deal was “inadequate in multiple respects.”

SanDisk’s shares shot up $7.81, or 52 percent, to $22.85 in after-hours trading after ending the regular session up 63 cents at $15.04.

Samsung, in turn, said it had reiterated its $26-per-share cash offer for Milpitas-based SanDisk.

In letter to SanDisk’s board dated Sept. 15, Samsung Chief Executive Officer Yoon-Woo Lee said that after four months of negotiations, SanDisk “continues to cling to unrealistic expectations on both its standalone market value and an appropriate merger price.”

But SanDisk shot back saying the price offered by Samsung undervalues the maker of flash storage and memory cards used in digital cameras, cell phones and other electronics.

SanDisk said Samsung had indicated that “it might be willing to pay a significant premium” to SanDisk’s closing price of $28.75 per share on May 22, 2008, which it said was the date Samsung first approached SanDisk about a possible deal.

Samsung’s offer “is an opportunistic attempt to take advantage of SanDisk’s current stock price,” the SanDisk statement said.