Number one...get your dog to a veterinarian or emergency clinic as soon as possible. A dog that is not eating and vomiting can become severely dehydrated and go into physiological shock. The longer it takes to have the dog checked and treated, the more likely that the situation will become more serious and difficult (as well as extremely expensive) to treat.
There are so many conditions that can cause these type of symptoms including infections (bacterial/viral/fungal/parasitic), foreign bodies (eating something that has caused blockage in the gastrointestinal tract), gastrointestinal upset (inflammatory bowel disease, toxicosis, pancreatitis, dietary allergy), gastric or intestinal torsion (twisting), metabolic diseases (Diabetes, liver disease, kidney disease/failure, Addison's disease), cancer, and so many other causes.
It can be seen from the listing above that there are a multitude of causes for those symptoms and the treatments vary, so a swift and proper diagnosis is essential to resolve the condition.
take your dog to the vet
Symptoms of a dog eating a battery may include vomiting, drooling, difficulty breathing, abdominal pain, lethargy, and potentially seizures. It is important to seek immediate veterinary care if you suspect your dog has ingested a battery.
The superlative form of listless is most listless.
He will start eating and drinking and the scours and vomiting will stop. He will also get up and start moving around until he reaches his regular activities.
You need to take your dog to the vet, now!
Since toothpicks have sharp ends, they can cause a number of serious, even fatal, health problems in your dog. Some of the symptoms to watch for are bleeding from the rectum and/or mouth, bloody stool, vomiting, no appetite, diarrhea, listless, weak, pale gums (due to internal bleeding). But these are only some of the possible symptoms, there could be others depending on what injuries the dog may have sustained.If you know, or even suspect, your dog has eaten toothpicks, contact your vet or emergency animal clinic immediately.
If the dog refuses to eat and there is no symptoms like vomiting or the scours then give him a little longer but not to exceed 5 days and if he still isn't eating or drinking consult you local vet
It is important to monitor your dog for any symptoms after eating a corn cob. If your dog shows any signs of distress such as vomiting, diarrhea, lethargy, or difficulty passing stool, it is recommended to seek immediate veterinary care.
Listless - lacking energy
If a dog ingests money, it could cause a blockage in the digestive system. This can lead to symptoms like vomiting, abdominal pain, and loss of appetite. It's important to contact a veterinarian immediately if this happens.
The dog will most likely stay lying down for most of the day, eating more, vomiting, grow a larger belly, more protective of area, and more aggressive when threatened.
Eating grass in small amounts is generally harmless for dogs and can help with digestion. However, excessive grass-eating could indicate an underlying issue such as an upset stomach or dietary deficiency. If your dog is vomiting frequently after eating grass or showing signs of illness, it's best to consult with your vet.