I used Hartz Ultra Guard flea and tick spray on my dog earlier today and the past few hours he has been acting very weird and just staring at me and not eating and drooling on the floor. When I tried to look in his mouth there was foam there. I just found this site and need someone to tell me what to do??? I used it on him before and he went around barking like something was hurting him but I just thought it was the fleas getting off him. But this time he is acting very strange.