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Hello, this is Dr. Jess. I am sorry to hear Scrappy isn't feeling well. My first suspicion based on what you are telling me is that Scrappy could be having a problem with his back- a mild slipped disc. These are seen often in beagles, and can present how you are describing- holding their posture in a strange way, moving gingerly (they are trying to avoid movement that would cause more pain), the panting is likely a result of pain or discomfort. The diarrhea could be a result of stress, or a result of changing his food. I would recommend getting him in to your vet so they can examine him and see if a back problem is the case (we call this intervertebral disc disease), and prescribe some medication to help him be more comfortable- we usually prescribe a muscle relaxer, pain killer, and either a steroid or a nonsteroidal anti inflammatory medication. In the meantime you should keep him as quiet as possible/as little moving around as possible. Outside only on a leash to potty, no jumping on furniture, no stairs, kennel him or keep him in a small room when you aren't there to supervise him.
Please let me know if you have any other questions!
His drinking and eating is also likely reduced because it may be uncomfortable for him to bend down /posture to eat and drink. You may try hand feeding him if you think he isn't getting enough on his own. Let me know if you have any other questions. If not, please take a moment to rate our conversation so we can know if you were satisfied with our service,and I can get credit for helping to answer your question. Good luck and Thank you!