There are many more cases of the SWAT team going to a wrong address or having bad information for other reasons and shooting innocent people than there are of SWATTING. Giving hard time to people who commit SWATTING would not address the larger problem of police that are out of control and want to shoot everything that moves.
It in pretty regular that the dog will be shot no matter what the situation, even if the people there are all innocent bystanders. It has also happened that grenades have been thrown into baby cribs. It was a flash grenade, but it still killed the baby. And there are elderly people in bed killed when the SWAT team breaks down their door. There are even web sites that keep track of all the hostile and inappropriate actions by SWAT teams.