Little Potpie is sick. She doesn't have a snotty nose or runny poop, but she seems like she has something in her throat/chest (sometimes she wheezes) and at times, she seems tired. They've been treated for parasites and I switched Potpie and her friends to medicated feed. She's actually gotten better since she's been on that feed, but she still has that "chest" thing going on. She is not sneezing, her eyes are clear, and she's a little girl, so I'm not sure how much she's supposed to weigh. Nobody else is acting like this. Any ideas of what I can do for my girl?