Experienced and professional animal trainer provide their insights in answering this question :
A. You need to see your vet or emergency vet straight away as there may be a blockage and I would also be concerned about dehydration now too.

How to Identify Common Pet Problems ?

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

Dogs sometimes vomit up yellow foam. This yellow foam is a form of bile, or digestive fluid, that is produced in the liver, stored in the gallbladder, and released into the small intestine, just below the stomach. This yellow foam usually means that its stomach is empty and the bile is causing stomach irritation.
Yellow vomit in dogs usually indicates that there is bile present. Bile is a digestive juice that is produced by the liver and stored in the gallbladder until it is needed by the body. When a dog eats, bile is released into the small intestine to help break down the food.
If you see your dog vomiting yellow bile when he also has constipation or can`t keep any fluids down … take him to the vet right away. If your dog repeatedly vomits yellow or white foam, or he`s trying to vomit with nothing coming out, it could be a sign of bloat (also called GDV – gastric dilatation and volvulus).
The best thing to do for a single episode of yellow vomit in an adult dog is withhold food and water for 12 hours. This will allow the stomach to settle. Offer your pet a small amount of bland food after this period and see what happens. If they eat with gusto and go on as usual, you have nothing to worry about.
Should I feed my dog after vomiting yellow bile? If your dog is vomiting bile after a long period of fasting, this may mean that the lack of food in their stomach has caused bile to leak from the small intestine back into the stomach. In this case, you can feed your dog small amounts of food after they vomit.
As a dog owner, watching your furry friend vomit can be a worrisome experience. And when the vomit is yellow in color, it can make you even more concerned. Yellow vomit in dogs can be caused by a variety of factors such as bile buildup, food allergies, empty stomach, intestinal blockage, or worse, liver disease.
If your dog throws up bile only once, continue to monitor for more vomiting or any other symptoms, such as diarrhea or lethargy. If your dog vomits twice in 24 hours, take them to the vet. You should also take your dog to the vet if they vomit yellow bile consistently, such as once a week or every few days.
If your dog is throwing up, but still acting otherwise normal, it`s possible that your pet has either chronic gastritis (inflammation of the stomach) or food indiscretion. Food indiscretion in dogs is very common when they get so excited about eating that they eat too fast or too much, and some of it comes back out.
In cases where the cause is thought to be dietary indiscretion, your veterinarian may advise you to withhold food for a short time, until vomiting appears controlled. After this time, you may be advised to feed your dog a bland, easily digested diet.
One of the most common ways to help a dog that is recovering from vomiting is to feed them a bland diet (usually white rice, sweet potato, boiled chicken or white fish). If your dog has been treated by your vet then they may also give your dog a specially prescribed diet and some medication to help them feel less sick.
The yellow color comes from bile, a natural digestive fluid in your dog`s gastrointestinal system. Most isolated cases of yellow vomiting are caused by bilious vomiting syndrome (BVM), which isn`t a serious health problem if it only happens once in a while.
The most common reason for a dog to throw up white foam is GI distress. Foamy vomit may occur if a pooch has excess gas in his stomach. If your dog is experiencing indigestion and there`s nothing left in his stomach to expel, he may start throwing up this pale, frothy liquid or foam.
The classic symptom of bilious vomiting syndrome is vomiting on an empty stomach. This usually occurs first thing in the morning since most dogs don`t eat throughout the night. Because the dog`s stomach is empty, all that comes up is fluid, mucus, and often some bile, which tinges everything an orangey-brown color.
There is a higher prevalence of pancreatitis in Miniature Schnauzers, Yorkshire Terriers, Cocker Spaniels, Dachshunds, Poodles, sled dogs, or other breeds. Some infections, such as Babesia canis or Leishmania, may also contribute to the development of pancreatitis.
The clinical signs of more advanced kidney failure include loss of appetite, lethargy, vomiting, diarrhea, and very bad breath. Occasionally, ulcers will be found in the mouth.
You should hold back giving water to a sick dog for two hours and food until 6-8 hours after their last episode of vomiting. Once this period is over reintroduce small, bland meals such as white chicken or rice gradually. If everything is ok the next day your dog can gradually return to their normal diet.
After a dog vomits, it`s generally best to withhold food for several hours and observe, but don`t withhold water. 2 If your dog vomits one time and then acts completely normal, you can probably resume your normal feeding routine within six to 12 hours or when the next meal is due.
Ginger is one of the best home remedies for your dog`s vomiting and upset stomach because it has anti-spasmodic effects. It is believed to help settle stomach irritation and nausea, helping your dog to feel better. It also works as an antacid that is easy for your dog to digest.
Dogs vomiting bile usually occurs on an empty stomach. Therefore, dogs are most likely to vomit yellow (bile) either halfway through the night or early in the morning when the stomach is empty.
Bile is created in your dog`s liver and stored in their gallbladder. Sometimes, though, the digestive tract isn`t working at its best, so your dog throws up bile. In this kind of situation, you need to take your dog to the vet to make sure that the vomiting isn`t a sign of some medical condition.
If you think your dog may be experiencing acid reflux, watch for these symptoms: Decreased appetite. Retching, burping, or gagging after eating. Lip licking (indicating nausea)

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. 2 year old Dachshund just started vomiting yellow foamy liquid today, has done it all day. Gave anti vomiting meds but she is still vomiting
ANSWER : A. You need to see your vet or emergency vet straight away as there may be a blockage and I would also be concerned about dehydration now too.

Q. 13 yo Dalmatian, suffers from colitis and arthritis. Vet recommended Chappie, and gave her all her life. Should we change it considering her problems?
ANSWER : A. Chappie was the original name of the product that is now known as Pedigree. Pedigree is considered a “grocery” style food, meaning it may not be as high quality or include higher quality ingredients as other products. However, the Pedigree line has expanded quite a bit in recent years and now offers many products tailored to dogs of all ages, sizes and breeds.

If your dog has done well on the product, you may be able to just switch over to a variety that is geared more to your dog’s needs such as a large breed senior formulation. Senior formulations often have added supplements to help with joint pain and arthritis later in life. However, if your dog has been experiencing problems with the food product, switching to a higher quality food such as one without grains may help. Higher quality foods will often have alternate grain sources to prevent digestive upset as well as higher quality meat cuts listed on the top of the ingredient list.

if you do decide to switch foods, the process should be done gradually over 7-9 days. For the first 2-3 days 25% new/ 75% old should be given, then 3 days of 50/50, and 2-3 days of 75% new / 25% old before finally switching over. This will help minimize any stomach upset from changing to a different food too quickly and allow the intestinal bacteria to adjust.

Read Full Q/A … : Best Low Fat Dog Foods

Q. My cat will not eat the renal food my veterinarian recommended, can I feed a grocery store food?
ANSWER : A. Your veterinarian recommended a therapeutic kidney diet because it has ingredients that will help slow the progression of your cat’s conditions, especially phosphorus and lower protein levels. Many of the non-prescription or grocery store foods generally have high levels of phosphorus and would not be ideal for your cat.

To help your cat accept the new food It is important to do a transition. There are two reasons to do a transition:

1) Occasionally a pet will have a GI upset when switched to a new diet,

2) A pet will accept a new food better when a transition is done to allow the pet to get use to the new texture and flavor.

There is more of a chance with a hydrolyzed protein or different (high or low) fiber level food to cause a GI upset. Transition recommendation:

1) Recommend ¾ old diet – ¼ new diet

2) Do this for a few days; if no GI upset, go to the next step

3) ½ old diet – ½ new diet

4) Do this for a few days; if no GI upset, go to the next step

5) ¼ old diet – ¾ new diet

6) Do this for a few days; if no GI upset, go to the next step

7) End with 100% of the new food.

Sometimes a transition should be longer, especially for cats. Use the same recommendation, but instead of a few days, recommend doing each step for a week or more. If you cat is still not interested in the new diet you can research other non-prescription diets focusing on the labels for appropriate levels of phosphorus and protein.

Also, home cooking may be an option but make sure to provide adequate nutrients. A good website to consult is balanceit.com. This website helps you to create well balanced home cooked recipes and offers supplements to add into the diet.

Q. My puppy is throwing up her food this morning and yellow foamy stuff. Please help!
ANSWER : A. If the vomiting has only occurred once, it may be due to the fact that there was something causing a minor upset stomach in your pup. Yellow foam is often acid, and tummies that are upset or that have been empty for too long can cause this to appear in vomit. It may just be that your puppy needs an extra meal in the day to help keep her stomach happy. Eating a meal too quickly can also cause a pup to vomit up undigested food and foam, and feeding smaller meals more often, or slowing down your dog’s eating can help.

If the vomiting has only happened once, pick up your puppy’s food for an hour or two and then offer a bland meal of plain boiled chicken and plain rice. These bland ingredients can help settle upset stomachs while being enticing “people food”. If the vomiting does not occur again, you can return to a normal feeding schedule.

However, if the vomiting continues, worsens, or new symptoms appear along with it, then it is a good idea to schedule an appointment with your vet to rule out any more serious causes.

Q. My 3 month old puppy has had diarrhea, liquid form. This is the second day. What should I do? I recently changed his food as well.
ANSWER : A. Is he vomiting or lethargic? Food should always be introduced slowly over 7-10 days as that can cause diarrhea, if there are any other symptoms then contact you vet. Try introducing 3/4 of old food with 1/4 of new food for a few days & then half & half for a few days followed by 3/4 of new food with 1/4 old food for a few days before completely changing onto new diet.

Q. My dog has been throwing up a clear liquid (a little slimey) but otherwise acts fine. Could something be wrong?
ANSWER : A. How long has he been doing this? Ongoing vomiting (>2 weeks) warrants a vet visit, but if it’s a one-off, or happens very infrequently then it could be due to something he ate disagreeing with him. Is he is bright, alert and happy in himself I would monitor him, start keeping a vomit journal (seriously) of when he vomits, how much, what the vomit was like, what he was doing before and any other notes. This will be really useful for your vet if it requires further investigatoon. You can also try bland food – boiled chicken and white rice – in small amounts on his vomit days to give his tummy a rest. Withhold for 8h after a vomit and reintroduce the bland diet in small, frequent meals.

Q. Lab 12 yr old, vomiting dark brown liquid, black liquid stools not eating, sx x’s 2 days. How can I make her comfortable
ANSWER : A. Sorry, I don’t understand your notation “sx x’s”. As for the vomiting and diarrhea, the best recommendation I can give you is to seek veterinary care in order to determine what’s causing these symptoms. Signs of GI disease that have been going on for 2 days are unlikely to resolve on their own. She may have parasites, may have eaten something that didn’t agree with her, or she could have an infection of bacterial or viral origin. Other causes of vomiting and diarrhea include pancreatic disease (pancreatitis), kidney disease, and liver disease. Unfortunately I think this is something that’s not going to get better at home, and she needs medical intervention.

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

Q. Does an indoor cat need to be vaccinated every year?
ANSWER : A. In practice, I recommend a feline combo vaccine every year, but will generally start administering every 3 years once they have had their kitten vaccines and 2 additional yearly vaccines. Rabies, is required yearly by law, and if kept up to date can be good for up to three years also. Based on the age of your cat I would give a yearly feline combo and rabies, and then boost the combo again next year.