One dog picked up the disk and started to run with it in its mouth.

Almost at once, several other dogs started to answer the call of the first.

When the train stopped at 59th Street, the dog started to get out.

The dog may start to scratch at the door to be let out.

It was a little before 11:00 in the morning, and a dog had just started barking.

After about an hour the young dog got up and started to walk toward the road.

Then one night in May the dog had started barking again.

My dog started barking while I was talking on the phone.

The training has to continue even after the dogs start working, so they remain sharp.

The dog started to leap, then stopped less than a foot away from her.