My 5 month old puppy who is usually very energetic is acting weird. She was fine when i let, i came back 45 minutes later and she is drooling excessively and not playful at all. She seems lethargic. I checked her gums and skin, doesn't seem dehydrated. She drank a little bit of water. Her stools look normal and she was acting normal earlier. She won't eat. This has been going on for about 4 hours and she is still unlike herself. She whines every now and then.