My 12-year-old dog won't eat, is thin, and throws up yellow liquid.

It sounds as Nemo is suffering from a gastrointestinal condition, possibly an infection. it could also be due to ingestion of a foreign body material. i would recommend taking him to the vet urgently, he will need to be checked first, if the vet thinks it's a simple gastrointestinal infection he will need an anti vomiting injection, antibiotics and a special food for a few days in order to get better.

Poor Ginger! I would take her into a vet now. It can be very serious when a senior dog is vomiting, not eating, and is extremely lethargic. She needs veterinary are now, please take her into a vet right away. Best of luck.

I would definitely recommend some blood work, if this hasn't been done recently. Older dogs are prone to a number of health issues that can cause decreased appetite along with being less active - chronic kidney disease and hypothyroidism are two possibilities that are both very common. In many cases, these issues are treatable (at least to some extent) once a diagnosis is made, so it's well worth checking for them if you can - hopefully, there are some things you can do to make him feel better for as long as possible, even though he's getting older.

If the weight loss is more than 10% of the her body weight, this could be abnormal and should ideally checked. Gastrointestinal abnormal absorption of nutrients may be present and should be investigated. Usually chronic gastrointestinal inflammations/infections are responsible for it. I would start with a blood test and some imaging procedures of the abdomen (an ultrasound).

It sounds as Vinny is suffering from a gastrointestinal condition, possibly an infection. it could also be due to ingestion of a foreign body material. i would recommend taking him to the vet the first chance you get, he will need to be checked first, if the vet thinks it's a simple gastrointestinal infection he will need an anti vomiting injection, antibiotics and a special food for a few days in order to get better.

It sounds like poor Taco is sick! This vomiting could be caused by a severe GI illness, eating something rotten, pancreatitis, foreign body, or even cancer (which is always a possibility in an old dog). Given his age and the fact that he can't keep down water, I would take him into a vet immediately. Old dogs can very easily become dehydrated, and it's important that he's seen by a vet now to prevent that since he's vomiting water. The vet can diagnose what is causing the vomiting, and can prescribe an appropriate treatment.

Poor Prince sounds extremely ill if he just throws up food and is extremely skinny. In my opinion, this is a medical emergency and he should see a vet right away. He could have a foreign body preventing him from keeping down food, or a severe GI illness. He needs veterinary care now to diagnose what is causing this problem so he can be treated. Please take him into an ER vet clinic; if there isn't one in your area, there will be a vet on call for emergencies. The information to reach that vet is found on a clinic's answering machine or website.