I would have your Chihuahua examined by a veterinarian. If the signs just started within the past 12-24 hours and she appears stable you could wait overnight to see your regular veterinarian. If the vomiting is excessive, she seems very weak, or dehydrated I would go to an emergency clinic. It does not sound related to the sinuses.
There are many causes of gastrointestinal upset (vomiting and diarrhea) in dogs. The gut is their stress organ. Often we do not find the exact cause and just administer the supportive care needed. Your veterinarian will be able to administer fluid therapy subcutaneously (under the skin) or intravenously if needed. There are several injectable medications that can be used to stop the vomiting and settle things down.
Severe colitis (inflammation of the colon) can lead to vomiting and nausea. A fecal exam will be done to asses the bacteria and screen for intestinal parasites.
X-rays may be needed depending upon how severe things appear and based on the history--if your dog may have eaten anything that could be obstructing her intestines. If she is an older dog or there has been any toxin exposure then she will need bloodwork.
I am not surprised your dog is not eating. When dogs are nauseous or vomiting they do not want to eat. Do not attempt to feed your dog for at least 12 hours once the vomiting stops. Small amounts of water need to be offered frequently if you dog can keep it down.
Once the vomiting is under control oral anti-emetics (anti-vomiting) and Pepcid can be given.
There are many causes of gastrointestinal upset (vomiting and diarrhea) in dogs. The gut is their stress organ. Often we do not find the exact cause and just administer the supportive care needed. Your veterinarian will be able to administer fluid therapy subcutaneously (under the skin) or intravenously if needed. There are several injectable medications that can be used to stop the vomiting and settle things down.
Severe colitis (inflammation of the colon) can lead to vomiting and nausea. A fecal exam will be done to asses the bacteria and screen for intestinal parasites.
X-rays may be needed depending upon how severe things appear and based on the history--if your dog may have eaten anything that could be obstructing her intestines. If she is an older dog or there has been any toxin exposure then she will need bloodwork.
I am not surprised your dog is not eating. When dogs are nauseous or vomiting they do not want to eat. Do not attempt to feed your dog for at least 12 hours once the vomiting stops. Small amounts of water need to be offered frequently if you dog can keep it down.
Once the vomiting is under control oral anti-emetics (anti-vomiting) and Pepcid can be given.