Experienced and professional animal trainer provide their insights in answering this question :
A. Whether your pet is a dog or a cat, I would strongly suggest to take her to your veterinarian as soon as possible. Dehydration in puppies (or kittens) having vomiting or diarrhea is very common and can be a life threatening condition that require immediate veterinary attention.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

Puppies with vomiting and diarrhea should be seen by a vet if any of the following apply: They are lethargic, not acting normally or not wanting to play. The abdomen seems bloated or painful. There is a large amount of fluid being lost through vomiting or diarrhea.
Some of the signs of parvovirus include lethargy; loss of appetite; abdominal pain and bloating; fever or low body temperature (hypothermia); vomiting; and severe, often bloody, diarrhea. Persistent vomiting and diarrhea can cause rapid dehydration, and damage to the intestines and immune system can cause septic shock.
Call your veterinarian if the vomiting and diarrhea do not improve significantly within 48 hours of treatment. Gastroenteritis is a common condition seen in veterinary practice. Early recognition and treatment are the cornerstones to returning your dog to a normal healthy state as quickly as possible.
Bland, stomach-soothing foods like boiled chicken, rice, and pureed pumpkin can temporarily help your pup manage symptoms while keeping something in their tummies. However, always be sure to consult your veterinarian before introducing a new food into your puppy`s diet.
When signs of parvo start showing, the stool gets more watery, becoming brownish to black diarrhea with traces of blood. After signs of parvo start to show and diarrhea gets bloody and smelly, it`s a race against time because most dog fatalities happen within 2 to 3 days after the symptoms.
Since parvovirus B19 infects only humans, a person cannot catch the virus from a pet dog or cat. Also, a cat or dog cannot catch parvovirus B19 from an infected person.
Parvo smell has a unique very bad-smelling poop that is not easy to forget. The smell has been described as metallic, with hints of blood stench since the virus affects the intestinal walls, and a seemingly sweet scent.
The most prominent sign that you will notice is a complete relaxation of the body, your dog will no longer appear tense, rather they will “let go.” You will notice a slimming of the body as the air is expelled from their lungs for the last time and you may notice the lack of life in their eyes if they are still open.
Immediate veterinary care is critical to try to save a fading puppy. Treatments for fading puppy syndrome include warmth, fluids, and oxygen. Antibiotics are given if there`s a bacterial infection. The puppy will be fed by hand until they are strong enough to nurse independently.
When should I take my dog to the vet for vomiting and diarrhea? If their symptoms haven`t improved within 12-24 hours you should bring them to the vet. You should bring them sooner if they`re displaying other symptoms such as; severe tummy pain, not drinking, lethargy or if there is blood in the vomit or feces.
Some dogs will not drink enough to rehydrate on their own, so it is extremely important to replenish fluids and electrolytes however you can. Try offering ice chips or a bowl of diluted chicken broth several times daily to entice your dog to drink. Also consider trying a bland diet like chicken and rice.
Withholding food for 12 to 24 hours, and providing water in small amounts frequently, can clear the cause of the upset and allow the gastrointestinal tract to settle. It`s usually the first line of attack for diarrhea. Before you decide on a fast, be sure that your dog is healthy enough to endure it.
1) Overfeeding – Many owners are unaware that overfeeding can cause loose stools. This is due to an `overload` of the digestive system, meaning it is unable to absorb what it needs and instead expelling it. This is more common in young puppies with sensitive stomachs but can happen at any age.
Treatment. If your puppy is overall healthy, your veterinarian may simply instruct you to feed a bland diet (such as plain boiled chicken, plain cooked hamburger, or rice) for a few days to give her digestive system a break. Probiotics intended for use in dogs can also be beneficial.
Your puppy will vomit and have diarrhea if canine parvovirus is present in their system. Vomit may be clear or a yellow or brown color, and diarrhea will often contain blood and be a light yellow or mustard colored hue.
Symptoms of Parvo

Your dog will not drink water nor eat, and very soon the pup will be stretched out and down on the ground, unable to get back up. They will become limp, weak, and unable to hold themselves up. Parvovirus, when left untreated, is often fatal. It requires veterinary oversight.

Parvo is so infectious that humans can spread it unknowingly to other dogs if they have recently come into contact with an infected pup, just by touching them. This means an innocent pat on the head could result in a life-threatening condition.
Some of the best home remedies for Parvo include giving your dog plenty of fluids, feeding them small, frequent meals of bland food, and keeping them clean and dry. Remember, the key to treating Parvo at home is to stay vigilant and seek veterinary care if necessary.
If your dog is being treated by a veterinarian and lives through the first four days after they start showing symptoms, there is a good chance that they will recover from the disease. It can take approximately a week for dogs to recover from Parvo.
IV fluids and management of electrolytes are the cornerstone of treatment for parvo. Antibiotics are given to prevent secondary infections, along with medications to help relieve vomiting, nausea and pain. De-wormer should be given since many puppies also have intestinal parasites that can worsen diarrhea.
The second stage of parvo, marked by the first time your dog suffers from projectile or bloody diarrhea, can last anywhere from four to ten days.
This illness is expensive to treat and ravages a dog`s body – symptoms often include severe vomiting and diarrhea. Some find that there is a distinct metallic smell to feces infected with parvovirus. If left untreated, parvo cases can escalate quickly and dehydrate the dog to the point of no return.
The parvo virus can also cause an inflammation of the heart muscle. The puppy cries, gasps for breath, stops nursing, and suddenly dies. This is most commonly seen in puppies less than eight weeks of age.
Diagnosis is considered a diagnosis of exclusion, as truly the only way to definitively diagnose this disorder is to microscopically examine the spinal cord of the affected animal after death.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. She is just ten weeks old and has diarrhea vomiting and can’t hold her self up. Seems about lifeless.
ANSWER : A. Whether your pet is a dog or a cat, I would strongly suggest to take her to your veterinarian as soon as possible. Dehydration in puppies (or kittens) having vomiting or diarrhea is very common and can be a life threatening condition that require immediate veterinary attention.

Read Full Q/A … : Vomiting in babies

Q. Nursing dog pups 13 days old has sudden onset of diarrhea and vomiting what can I do
ANSWER : A. You can try with holding food for 12 hours. Offer unflavored Pedialyte if she’ll drink. If she doesn’t vomit or have diarrhea for those 12 hours you can then offer small amounts of a bland diet such as boiled white meat chicken (25%) and boiled white rice (75%) without flavoring or fat added. Offer about 1/4 cup every 2 hours. If she continues to do well and has an appetite do this for 12 hours, then transition back to a normal diet slowly. If she continues to have vomiting or diarrhea I think it’s important that you seek veterinary care, since continual loss of fluid through vomiting and diarrhea while nursing is very dangerous to any dog, but especially to a very small dog like a chihuahua.

Q. Wants to go out very frequently. Has fecal matter attached to anus but won’t let me remove it. She won’t sleep and wants to stay on my lap.
ANSWER : A. So I’m hearing a couple of problems going on. Frequent defecation with diarrhea (I’m assuming, since there’s fecal matter attached and the anus, and typically it only “sticks” when it’s soft) and lethargy/clinginess. Pretty general signs, however let’s focus on the diarrhea and assume it’s a GI thing. You didn’t tell me whether this is a cat or dog but I’ll assume dog since you said she goes outside to defecate.

Diarrhea may or may not be a sign of a serious disease. I don’t get especially concerned with one or two episodes in an animal who seems to feel completely normally otherwise, but what you’re describing sounds concerning. Your dog is restless, can’t get comfortable, and is somewhat needy – all of those indicate discomfort to me.

Without knowing how old your dog is it’s pretty difficult to get specific about causes, but I’ll mention some possibilities. Certainly parasites, including giardia, can cause diarrhea, as well as bacterial or viral infections in the gut. Indiscriminate eating, which dogs are master of, can cause diarrhea. Food allergies or sensitivities as well as inflammatory bowel disease are on the list. More serious causes include liver, kidney, or pancreatic disease, as well as intestinal cancers.

I’m hoping this has only been going on for a little while. You can try feeding a bland/high-fiber diet of boiled white meat chicken and white rice (25% chicken and 75% rice) in small (1/4 to 1/2 cup) amounts frequently (every two hours). If the diarrhea doesn’t resolve in 12 hours see a veterinarian. If she’s vomiting or won’t eat at all, see a vet sooner.

Read Full Q/A … : Leerburg

Q. Changed dog’s food. Now throwing up and with diarrhea, what should I do?
ANSWER : A. Vomiting and diarrhea can occur if food is switched too quickly. Dogs generally need a slow changeover of foods over a period of a week or so to allow their guts and the gut bacteria to adjust. If there has only been one vomiting and diarrhea episode, removing the food for a few hours then feeding a bland diet of boiled chicken and plain rice can help soothe the stomach. You should then return to his old food and begin a gradual changeover of foods starting with 3 days of 75 old/25 new, 3 days of 50/50 and then 3 days of 25old/75 new. However if the vomiting and diarrhea symptoms do not improve, it may indicate something else causing his digestive distress and an appointment should be made with your local vet.

Q. My dog has suffered from diarrhea with vomit and bloody stools for about 3 months. Vet has given Metronidazole, but hasn’t been effective
ANSWER : A. Several things can cause a dog’s diarrhea, and chronic diarrhea can sometimes be hard to treat. However the most common causes of chronic diarrhea can be from food allergies to certain ingredients in the diet as well as a disruption in the gut bacteria. Metronidazole helps with chronic diarrhea in some cases if there is an underlying bacterial condition. Checking your dog’s food for common allergens such as wheat, corn or soy products may alert you to a problem as these can cause a lot of digestive issues in some dogs. Some dogs may also be allergic to more common protein types such as beef, lamb or even chicken, so finding a food with an alternate protein source can also help. Natural remedies to help clear up diarrhea can also include adding plain yogurt to meals to seed the gut with healthy bacteria, or adding pureed pumpkin to provide a fiber boost to firm up stools. However, if these things don’t help with the diarrhea, additional testing and treatment with your vet is best.

Read Full Q/A … : Causes of Blood in Dog Stool

Q. He is not eating or drinking seems like he has no energy and vomiting and seems like he weak
ANSWER : A. Causes of not eating and vomiting can be many. Gastrointestinal infection, caused by bacteria (salmonella, for example) or viruses or parasites (although parasite infections tend to be more mild, but giardia can make them feel pretty bad) can be a cause. Eating something he shouldn’t have, like the trash or rotten food can cause it. Intestinal obstruction can cause vomiting as well. Other causes (non-GI) of vomiting include kidney failure (can be due to many things, such as toxins, kidney stones, cancer) or liver diseases or liver failure.

The vomiting is concerning, however the weakness and lack of energy implies that he’s either seriously dehydrated or there’s a lot more going on than just s simple case of vomiting. He needs to see a vet and have testing, likely to include x-rays and/or blood work, to see what’s going on, so that it can be treated.

Q. My 10 week old puppy threw uplast night and had diarrhea this morning. We forgot to water down his dry food last night and he usually eats soggy food.
ANSWER : A. It probably isn`t anything to do with not watering down the food. It is not unusual for puppies to pick up tummy bugs. If he has stopped vomiting and now having diarrhea it sounds like the bug is passing through nicely. If he becomes lethargic or vomiting continues then contact your vet. Has he mixed with unvaccinated dogs? If so and there is a possibility that it could be parvo, but the vomiting & diarrhea would continue and the pup would be lethargic.

Q. Which common foods are poisonous to pets?
ANSWER : A. That’s a great question. As responsible pet owners we need to be aware of food items that can be harmful to our canine or feline companions. Here are some of the most common foods proven to cause illness in our animals at home:

Chocolate: A favorite and irresistible treat amongst most humans, chocolate is considered toxic to dogs. In very small amounts it is usually not a huge issue, but with larger volumes and with darker chocolates pet owners should be concerned. Chocolate contains methylxanthine theobromine, which is similar to caffeine. Chocolate ingestion can cause vomiting, diarrhea, hyperactivity, issues with normal heartbeats, seizures, and in some severe cases, death. It is best to keep your favorite chocolate treats in a good hiding spot and out of reach of your dog or cat.

Grapes and raisins: Dogs should not consume grapes and raisins because of the risk of acute kidney failure. Most dogs experiencing grape or raisin toxicity will begin to have vomiting and/or diarrhea within 6-12 hours of ingestion. Other abnormal clinical signs include lethargy, abdominal pain, dehydration, and tremors. Kidney failure develops within 24-72 hours of the initial ingestion. There are some dogs that do not experience these devastating side effects. It is best to contact your veterinarian or veterinary emergency facility if you believe your pet has ingested grapes or raisins.

Garlic and onions: We often forget that our meals contain these two popular ingredients and will allow our furry companions a few bites or licks. Onion and garlic both can cause a type of poisoning that results in damage to red blood cells, making them more likely to rupture. They can also cause stomach upset and mouth irritation. Look for pale gums, increased breathing or drooling or any vomiting or diarrhea.

Bread dough: Unbaked bread dough is considered poisonous to our pets. The bread dough, when ingested, expands in the stomach because of the warm and moist environment. This can lead to a bloated or even twisted stomach. In addition yeast is often added to our baking products to help get bread to rise, and when this yeast is fermented it produces both carbon dioxide and alcohol. The alcohol produced can be absorbed into the bloodstream and causes dangerous drops in blood sugar, blood pressure and body temperature. Common clinical signs include vomiting or retching, distension of the stomach, weakness and collapse.

Macadamia nuts: Ingestion of these nuts are not proven to be fatal in dogs but can cause them to experience uncomfortable clinical sings, including fever, joint stiffness, vomiting, tremors and difficulty walking, especially in their hind legs. Often your pet will start to feel better after about 48 hours, but supportive veterinary care (such as pain medication) may help ease their discomfort.

Xylitol: The most common ingredient used in sugar-free gum is xylitol, which is a non-caloric sweetener. It is also found in some oral rinses, toothpastes and vitamins. Xylitol and dogs do not mix – it can cause a dangerous drop in blood sugars levels. Dogs will often display signs of disorientation, black tarry stool, tremors and seizures. If severe enough some dogs have developed liver failure. Keep your gum away from your canine companion.

Avocados: Avocados are not actually poisonous to dogs or cats but as many veterinarians can tell you the avocado pits can cause a foreign body obstruction. Avocados contain persin, which is actually toxic to the majority of pet birds. The abnormal clinical signs associated with avocado ingestion in birds include, respiratory distress, inability to perch, liver and kidney failure and sudden death.

Go forth and enjoy your favorite foods, but keep in mind which foods you should avoid sharing with your furry family members. Whenever in doubt, contact your veterinarian for healthy and safe food suggestions.