Experienced and professional animal trainer provide their insights in answering this question :
A. It sounds as though he may have an upper respiratory infection. The vomiting is concerning, however. I would worry about dehydration especially in such a young dog. A vet check up to determine what type of medication is required for his specific illness is advised.

How to Identify Common Pet Problems ?

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

You should contact your veterinarian if you notice any one of the following symptoms: Unilateral (one-sided) nasal discharge. Green or blood-tinged nasal discharge, affecting one nostril or both. Accompanying symptoms of a runny nose in dogs such as coughing, lethargy or anorexia (loss of appetite)
Typical signs of Kennel Cough are: Dry hacking cough (sounds like honking) Thick yellow or green discharge from eyes or nose.
Nasal discharge and sneezing can be a sign of relatively benign viral infections or allergies, but parasitic infections, more serious infectious diseases such as distemper, or nasal cancers can also trigger discharge. Assessing the type and severity of the discharge is necessary to determine appropriate action.
Kennel cough symptoms include a dry, hacking cough resembling a goose honk and nasal discharge. In severe cases, dogs may appear to choke or gag.
Green snot means that the bacterial or viral sinus infection has progressed and your immune system is really fighting back. The green color is a result of dead white blood cells and other waste. If you still have green snot after 12 days or have had constant green snot for months, it may be time to call your doctor.
Green mucus means that the infection is a bit stronger. The green coloring means that lots of white blood cells have been working overtime to fight the infection. The infection will eventually go away, but if your snot is still showing up green after 10-12 days, talk to your health care provider.
Dogs that have bacterial pneumonia usually have a high fever, difficulty breathing, decreased exercise tolerance (tire easily), are lethargic, and/or have a cough. Other signs that may be present include a nasal discharge, loud breathing, rapid breathing, weight loss, anorexia, and dehydration.
The classic symptom of kennel cough is a dry hacking cough, often described as a “goose-honk” cough. Many dogs will cough in small fits until they bring up white frothy phlegm. Depending on the dog and severity of infection, some animals remain normal in demeanour apart from the cough.
Home remedies to clear your dog`s sinuses include using a humidifier, flushing the sinuses with saline, using a nasal aspirator, or giving Benadryl. Be sure to ask your vet before administering any human over-the-counter medicines to your pup.
What does a pneumonia cough sound like? This will depend on the type of pneumonia you have and be either a dry or chesty cough. Bacterial pneumonia is more serious and often results in a gurgling sound when breathing and mucus or phlegm when coughing.
Dogs and cats do catch colds, and their symptoms are just like humans. Both may have discharge from their noses, “wet” or labored breathing from congestion, sneezing (especially wet sneezes), watery eyes and lethargy (napping more, showing low energy). The cold symptoms will likely last 5-10 days.
The signs of this illness in dogs are cough, runny nose, fever, lethargy, eye discharge, and reduced appetite, but not all dogs will show signs of illness. The severity of illness associated with canine flu in dogs can range from no signs to severe illness resulting in pneumonia and sometimes death.
Mucus Colors Meaning

If the yellow color is accompanied by thick and discolored nasal discharge, it may be a sign of a sinus infection. Green mucus can be a sign of a more severe viral or bacterial infection. The green color is caused by the presence of white blood cells that are fighting the infection.

White Mucus

If a virus makes its way into your nose and into the air-filled pockets behind your forehead, cheeks and nose — called the sinuses — your nose may start to make extra mucus to clear out the virus. After a few days, it might begin to turn white.

Here`s what the color of mucus indicates: Cloudy or white mucus is a sign of a cold. Yellow or green mucus is a sign of a bacterial infection. Brown or orange mucus is sign of dried red blood cells and inflammation (aka a dry nose).
Mucus can turn different colors for a variety of reasons. White snot can occur with a cold, for example, and pink boogers can be a sign of pregnancy. And while green or yellow snot may indicate a bacterial infection—and a need for antibiotics—it can also signal that your body is on the mend.
Sometimes, people experience a runny nose on one side, through just one nostril. Rarely, this can be a sign of an anatomical problem, like a leak of cerebrospinal fluid. It could also be caused by a deviated nasal septum.
The most important scenario is the presence of unilateral one-sided nasal discharge. In adults, the presence of a unilateral discharge can be due to the presence of a serious medical condition such as a tumour and therefore needs to be urgently referred for assessment. See red flag symptoms.
Causes of Pneumonia in dogs

Viral infections can easily spread from dog to dog) Aspiration (when a dog inhales food, liquid or solid material into its lungs – often seen in a dog that has vomited) Inhaled irritants (smoke, air pollutants, aerosol sprays and more)

YES! Cold weather causes problems for dogs just as it does for their owners. Pooches rely on their respiratory system to stay warm. When the air is icy, their bronchial tube can constrict, which can turn a normal infection into pneumonia!
Veterinarians prescribe antibiotics to dogs with primary or secondary bacterial pneumonia. Most common antibiotics include Doxycycline, Fluoroquinolone and Amoxicillin-clavulanic Acid. Treatment length is typically long-term, sometimes more than a month.
Kennel cough usually causes a dry, hacking cough, while pneumonia typically causes a cough with phlegm. Kennel cough may also cause sneezing, runny nose, and watery eyes, while pneumonia may cause chest pain and shortness of breath.
Why is my dog coughing up white foam? Coughing up white foam can be a sign of Kennel Cough, bloat or gastrointestinal distress. The latter two conditions are classed as emergencies, so if your dog is coughing up white foam, contact your vet or emergency care provider right away.
What is rhinitis in dogs? Rhinitis is a disease that affects both humans and dogs, causing nasal congestion, runny nose, sneezing and itching. Most types of rhinitis are caused by inflammation and are associated with symptoms in the eyes, ears or throat.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. 8 week old Boston Terrier dry nose. Mucus discharge through left nostril only lite green color, thick consistency. Mouth breathing some vomitting
ANSWER : A. It sounds as though he may have an upper respiratory infection. The vomiting is concerning, however. I would worry about dehydration especially in such a young dog. A vet check up to determine what type of medication is required for his specific illness is advised.

Q. My cats nose is stopped up on antibiotics. She has a loss of appetite, acting normal though. Is 3 ounces of can food enough in 24h? 9 pound cat
ANSWER : A. Cats with stopped up noses tend to eat much less, as you’ve noted, because they can’t smell their food as well. And the smell of food is pretty important to a cat’s appetite. You can start by warming up the food in a microwave – not too hot, test it yourself by putting your finger right in the center, as the temperature of microwave food can vary – as this will intensify the smell and hopefully make your cat more interested.

Saline nose drops, like those that are used on little kids, are safe to use on a cat to clean the discharge that is dried around and in the nose. There’s a brand called Little Noses that’s available in the U.S. That I like. You can put it on a q-tip and try to remove the debris. Humidifying the air with a humidifier can help as well, or you can put the cat in the bathroom and run the shower enough to generate steam. Don’t use “real” nose drops like Neo-synephrine or anything else like that – cats quickly build up resistance to them.

A 3 oz can of food is an OK amount in 24 hours, but do try the techniques above to help your cat get more interested in food. You might also try some baby food – no garlic or onions in the ingredients – as cats usually really like the taste of it.

Q. My cat has a runny nose along with runny eyes. Should I worry?
ANSWER : A. Runny noses and eyes are common disorders in cats, and are usually a sign of an underlying condition. The most common one being an Upper Respiratory Infection.

This condition, also known as “cat flu”, is seen most often in kittens. It is caused by one of several viruses or bacteria and common symptoms include a runny nose, runny eyes, sneezing, wheezing and congestion.

In some cases, the discharge may change color to greenish or yellow, indicating a secondary infection. Cats that are in high stress environments or in contact with other cats are most likely to get URIs.

At home, be sure to keep your cat eating and drinking to prevent dehydration. You can also use a warm washcloth to remove any debris from the eyes or nose that is making seeing or breathing difficult.

Finally, keep in mind that if the symptoms continue for more than a day or two, the discharge becomes green or yellow, or your cat appears to be feverish or in distress, veterinary care should be sought without further delay.

Q. My French Bulldog (11 months) threw up after eating and is dry heaving, plus he’s not acting normal. His breathing is nasally and he’s lethargic. Help
ANSWER : A. Vomiting is a common symptom that can be a sign of numerous health issues ranging from minor digestive upset, to bloat or internal illness. If the vomiting has only occurred once and everything else is normal, a bland diet of plain boiled chicken and white rice can help.

Since your Frenchie is having other issues such as trouble breathing and lethargy, it may be a good idea to contact your vet for advice. Minor digestive upset can cause lethargy due to the energy expended in vomiting, however prolonged symptoms usually indicate something more serious is going on.

Bulldogs are one breed that are prone to bloat (though any breed of dog can be affected), a serious medical emergency. Signs of bloat can include a suddenly painful and bloated abdomen, signs of distress such as heavy panting, whining, or trouble breathing, pale gums and tongue, vomiting and diarrhea, or attempting to vomit or defecate without success. If you suspect your dog may be experiencing bloat please contact your vet or emergency clinic immediately.

Q. Is it normal for a boston Terrier to have a dry or crust nose?
ANSWER : A. Some of these dogs do have dry and crusty nose. If he/she has been always like this I would assume that this is normal. If the nose has gone dry and crusty recently I would suggest you to take your dog to your vet tot make sure he/she doesn’t have any skin disease.

Q. My cat has a snuffly nose and I’m worried in case it is causing him not to be able to breath properly.
ANSWER : A. If he is breathing through his mouth he must be examined as an emergency, if it is just snuffly more like a human with a headcold it is unlikely to become immediately worse. You can try bathing his nose gently with warm water if there is obvious discharge blocking his nose and placing some olbas oil or vicks rub in hot water close to him to relieve congestion – do not allow him to drink it though! It is likely he has developed a respiratory infection. Most of these are viral but bacterial infections can also develop and wold benefit from treatment, very occasionally cats can also get foreign bodies such as grass seeds stuck in their nose causing distress and these would need to be removed

Q. over the past few weeks he will go through sporadic sneezing fits.I have since noticed discharge from eyes and nose. It’s green in color. He is 15 yr
ANSWER : A. The green discharge may be indicative of infection. In an older pet, this can be serious. Have your vet exam your pet. Chest xrays and bloodwork should be done to rule out infection or respiratory disease. Monitor for lethargy or difficulty breathing.

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Q. My cat is sneezing and has a warm runny nose. What can I do for him. Can’t afford a vet right now
ANSWER : A. If the discharge is clear, this may be a mild self-limiting viral infection. Many cats have the herpes virus living dormant in the nerves around the face and head. In times of stress the immune system is suppressed and the virus replicates and makes the animal clinically sick.

You can stimulate his appetite by offering canned foods that you’ve warmed slightly in the microwave – this intensifies the smell and encourages them to eat. You can also flavor his water with a small amount of chicken broth or clam juice. Put him in the bathroom when you take a shower or run a humidifier to get some steam in the air and soothe his nasal passages. And you can use children’s saline nose drops – Little Noses is a brand I like – to clean dried debris from the nose.

If the discharge becomes cloudy, yellow, or green, I’m sorry but this indicates bacterial infection and he needs to see a vet.