Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you. I apologize that no expert has jumped in to answer your question yet.
But I am afraid no one has answered because we do not have good news for you. At his small size and in his current condition (bloody nose, coughing), these are clear indications that this is a medical emergency. He needs to be seen by his veterinarian or an emergency veterinarian immediately. There are no over-the-counter products I could recommend that will help this situation, and depending on what is going on, some products could actually worsen the situation. It sounds like you are looking for pain relief, but our only over-the-counter options are the aspirin-related products which would be a very bad choice in a dog with any bleeding problems. It could worsen his bleeding issue. I also worry that at his older age he may have some level of kidney or liver compromise as happens in many of our older patients, and if present, then an aspirin-related product may cause a mild organ problem to progress to organ failure and death
. The only "safe" pain relief options are prescription, which means he must see his veterinarian.
I regret that I cannot provide a diagnosis for the cause of what you see but there are many potential causes ranging from bleeding problem (which can come from liver failure or exposure to rat poison) to tumor (nasal?) that has metastasized to his lung to infection (fungal, bacterial, rickettsial which is tick-borne disease) to immune-mediated disease, and the list continues. Some of these problems are easily treated while others are not. If he was my patient I would need to perform a complete exam followed by some testing (CBC, chemistry profile, urine check, thyroid screen) +/- X-rays to try to narrow down the cause.
I am at a point I need to know what questions you have. We can continue our dialogue in this setting.
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