I gave my boy Johnson One Dose Easy Wormer tablets this morning, three with his breakfast as it said. Since then he's been kinda off all morning, a bit whiney, not interested in his Kong which he usually is. He's now just been sick but is still lively and is now at his Kong. Do you think this is likely to be the wormer that's caused this? Also, will I need to worm him again now? Any advice would be gratefully received.