My ferret Dot (who is normally much less active) has been even more lethargic today and her belly feels very firm. I isolated her so I could monitor her food and water intake and poop. I gave her some Vaseline two hours ago and she has pooped once since (fairly normal). She does react to me and is up walking around, but her belly feels like a water balloon. She has only eaten a tiny bit of food in the past three hours. Should I give her more Vaseline? Do I need to take her to the vet first thing in the morning or am I overreacting?