Experienced and professional animal trainer provide their insights in answering this question :
A. You should see a vet to check what is going on. Bad smell from the oral cavity can be caused by dental disease, some general disorders like diabetes, kidney failure, bad diet, abscess … It is impossible to make a diagnosis without clinical examination

How to Identify Common Pet Problems ?

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

Anal glands are small paired sacs that sit on the left and right side (around 5 o`clock and 7 o`clock) of your dog/cat`s anus. The cells lining these glands produce an oily secretion with a distinct rotten fishy, metallic smell.
A metallic or ammonia odor on a dog`s breath is a common symptom for kidney failure. The iron smell is caused by a build-up of waste products and toxins generally filtered by the kidneys.
Dogs with liver failure often have breath that smells like a dead animal. Some of the symptoms that are present in liver disease include: Vomiting. Diarrhea.
Medical Reasons Dogs May Stink

Secondary yeast or bacterial infections on the skin or inside the ears remain the most common medical reasons dogs might smell awful. Allergies often begin the process, which leads to scratching and licking that open the door for infections.

A metallic smell on your body is typically a type of body odor triggered by handling copper or other metals. It can also result from your body burning protein rather than glucose during a workout.
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 common cause of halitosis in the dog is periodontal disease arising from plaque (biofilm) and tartar build-up.” The primary cause of bad breath in dogs is bad bacteria causing decay that creates smelly sulfur compounds.
Kidney disease can cause the breath to smell like ammonia (similar to bleach). Liver disease can cause foul, sweet, musty breath. Diabetes can cause the breath to smell sweet (similar to pear drops or nail polish remover).
Kidney Disease

If your dog`s bad breath smells like feces or urine, it may be a sign that they have recently eaten poop (which is never fun for a dog parent) or a symptom of underlying kidney issues.

Most often, it`s caused by dental or gum disease, and small dogs are especially prone to plaque and tartar. However, ongoing bad breath can indicate medical problems in a pet`s mouth, respiratory system, gastrointestinal tract or organs.
Arthritis and other health conditions can make it difficult for your dog to properly groom himself, which can cause his fur and skin to smell funky over time. Weekly shampooing or visits with a professional groomer can help. Impacted anal glands are also common in older dogs.
He will be relaxed, yet alert. He will show no signs of aggression and may attempt to guard a person who isn`t feeling well from other people. His ears will tilt toward what he is trying to hear. When he is sniffing something different, his tail will be held high and it will not wag.
Rubbing blood over skin results in a similar metallic smell based on the same scent molecules. Blood also contains iron atoms. Says Glindemann, “That humans can `smell` iron can be interpreted as a sense for the smell of blood.
An olfactory hallucination (phantosmia) makes you detect smells that aren`t really there in your environment. The odors you notice in phantosmia are different from person to person and may be foul or pleasant.
You may find that foods smell or taste differently after having coronavirus. Food may taste bland, salty, sweet or metallic. These changes don`t usually last long, but they can affect your appetite and how much you eat. For a very small number of people, your change of sense of smell or taste may be more long-term.
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.
These include loss of appetite, vomiting, diarrhea (which may be bloody), and dehydration. The bloody diarrhea might be mild or absent with any of the variants, but affected dogs are more likely to stop eating. Without treatment, many affected animals die. Some severe cases may die despite aggressive treatment.
Diabetes: When diabetes becomes unregulated or untreated for a long enough period of time, the body starts breaking down fat, creating molecules called ketones. Dogs that are producing ketones secondary to diabetes may have an acetone or sweet smell to their breath.
When the kidneys fail to remove all of the urea, the urea breaks down into ammonia. Hence, the reason people with renal problems often have breath that smells like chemicals or ammonia breath. Additionally, the body is unable to absorb calcium properly as a result of kidney disease.
Abscesses or cavities in the mouth and teeth often cause fishy smelling breath. Plus, foreign objects – like food or sticks – can also get lodged in the mouth and cause a foul smell. Sadly, it`s estimated that 80% of dogs by the age of two are affected with some degree of dental disease.
But if the kidneys aren`t functioning properly, the breakdown products (which are toxic) build up in the bloodstream. One of them is urea nitrogen, which can break down further into ammonia. A dog with high levels of it may end up with an ammonia- or urine-like odor on his breath. Faintly sweet or fruity.
There are several reasons why your house might suddenly smell like bleach. You might have a plumbing issue causing bleach-like fumes, your pool chlorination system might have malfunctioned, or you might have accidentally spilled bleach somewhere in your house.
At about four to seven months of age, your puppy`s baby teeth will dissolve at the root, loosen, and fall out to make room for their adult teeth. You may notice the musty, metallic odor of blood on their breath, it can smell like a handful of pennies.
Give Your Dog Yogurt or speak with your vet about Probiotic Supplements. Some research has shown that the good, active bacteria found in yogurt and probiotics can help with stinky breath by killing odor-causing bacteria found in the mouth. Good bacteria can also help with digestive and other health issues!

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My cat is excessively scrstching herself., to the point she has sores. She is strictly an indoor cat. Did have flees been treated for 2 months
ANSWER : A. For every flea you see on your pet, there are 100 more in the environment. Get your pet on a good topical or oral flea control through your vet. In flea control, you get what you pay for. Consider asking your vet for a dose of Capstar. It helps get the problem under control by killing the fleas on the pet starting in five minutes but only lasts for 24 hours.

You need to treat your home environment. If you use a pest control service, tell them you are having a flea problem and they can adjust their treatment. Use a premise spray that also contains an IGR, insect growth regulator. This keeps eggs and larvae from maturing into adults and helps break the life cycle. Also, vacuum EVERY DAY, throwing out the bag or emptying the canister every time into an outside receptacle and spraying the contents with insecticide to kill the fleas you’ve vacuumed up.

Treat your yard too, since fleas are opportunistic and will hop a ride into your home on your pant leg without you knowing it. Concentrate on areas under bushes, in the shade. Fleas are less likely to be located in open sunny areas where it gets hot.

If chemicals are a problem, you can use borax. Sprinkle it into rugs, into corners and under furniture, use a broom to work it into the fibers and let it sit for hours, days even. It won’t hurt you or your pet to have it present. Then vacuum it up, reapply as needed. Food grade diatomaceous earth can be gotten from a health food store and worked into the rugs and corners in the same way as borax. These treatments aren’t as fast and effective as chemical insecticides but they can help.

You might want to consider boarding your pet for the day at your vet, to give you the opportunity to flea bomb your house without having to worry about your pet being exposed. They can bathe your pet and give a dose of Capstar while you treat your home.

Be patient, you may have to repeat these steps multiple times 10-14 days apart to help break the flea life cycle.

Skin problems can have a variety of causes, sometimes more than one. It is important to have the problem checked by your vet to determine if there is a medical cause for your pet’s skin issues and treat accordingly.

In pets of all ages, fleas, food allergies and exposure to chemical irritants such as cleaners and soaps can be a cause. Any one of these may not be enough to trigger the breakouts, depending on how sensitive your pet is, but a combination can be enough to start the itch-scratch cycle. Finding out the cause and eliminating it is the best course of action. With flea allergies, if your pet is sensitive enough, a single bite can cause them to break out scratch enough to tear their skin.

Check for fleas with a flea comb. Look for fleas and/or tiny black granules, like coarse black pepper. This is flea feces, consisting of digested, dried blood. You may find tiny white particles, like salt, which are the flea eggs. Applying a good topical monthly flea treatment and aggressively treating your house and yard will help break the flea life cycle.

If you use plastic bowls, this is a possible cause for hair loss, though this tends to be on the chin, where their skin touches the bowl while they eat. If you suspect this to be the culprit, try changing the bowls to glass, metal or ceramic.

Food allergies are often caused by sensitivity to a protein in the food. Hill’s Science Diet offers some non-prescription options for sensitive skin as well as prescription hypoallergenic foods for more severe cases. Royal Canin carries limited protein diets that may also offer some relief. Your vet can recommend a specific diet that will help.

If there is no relief or not enough, consider getting your pet checked by a veterinary dermatologist and having allergy testing done.

Q. What could be causing my dogs hair to fall out causing bald spots?
ANSWER : A. Skin problems can have a variety of causes, sometimes more than one. It is important to have the problem checked by your vet to determine if there is a medical cause for your pet’s skin issues and treat accordingly.

In pets of all ages, fleas, food allergies and exposure to chemical irritants such as cleaners and soaps can be a cause. Any one of these may not be enough to trigger the breakouts, depending on how sensitive your pet is, but a combination can be enough to start the itch-scratch cycle. Finding out the cause and eliminating it is the best course of action. With flea allergies, if your pet is sensitive enough, a single bite can cause them to break out scratch enough to tear their skin.

Check for fleas with a flea comb. Look for fleas and/or tiny black granules, like coarse black pepper. This is flea feces, consisting of digested, dried blood. You may find tiny white particles, like salt, which are the flea eggs. Applying a good topical monthly flea treatment and aggressively treating your house and yard will help break the flea life cycle.

If you use plastic bowls, this is a possible cause for hair loss, though this tends to be on the chin, where their skin touches the bowl while they eat. If you suspect this to be the culprit, try changing the bowls to glass, metal or ceramic.

Food allergies are often caused by sensitivity to a protein in the food. Hill’s Science Diet offers some non-prescription options for sensitive skin as well as prescription hypoallergenic foods for more severe cases. Royal Canin carries limited protein diets that may also offer some relief. Your vet can recommend a specific diet that will help.

If there is no relief or not enough, consider getting your pet checked by a veterinary dermatologist and having allergy testing done.

Q. My dog ran away 3 days ago , he came back later and immediately threw up all his food. He hasn’t eaten and is still throwing up since then.
ANSWER : A. I’m really glad to hear your dog came back! If you dog is vomiting I would recommend having him examined by a veterinarian because his vomiting could be caused by a gastrointestinal disturbance. He could have eaten something that upset his stomach, including an intestinal parasite or he could have even consumed something toxic. It would helpful for a veterinarian to evaluate for any injuries he could have sustained while being out of the home and for any abnormalities that could be causing his sickness. Stress could also be playing a role in his stomach upset since he was out of the home for several days.

Q. The last few days my Doxie has had a strange metallic odor to her breath. What could be causing it?
ANSWER : A. You should see a vet to check what is going on. Bad smell from the oral cavity can be caused by dental disease, some general disorders like diabetes, kidney failure, bad diet, abscess … It is impossible to make a diagnosis without clinical examination

Q. My C. K. Charles has an asmathic cough. Ok most of the day, but worse in hotter rooms in the evening. What’s wrong?
ANSWER : A. Coughing in dogs can be caused by a number of things including allergies, asthma, illness such as Bordetella (kennel cough) or even lung and heart problems.

Allergies and asthma can cause a dog to have a raspy cough, and they may wheeze, sneeze or have running noses or trouble breathing when active or in an area where the allergen is present. Your vet can determine if an allergy or asthma is present and provide medication as needed to help with symptoms.

Bordetella can also cause a deep hacking cough, and is common in dogs that frequent doggy day cares, kennels or dog parks. The causes can be bacterial or viral, and treatment depends on if any secondary symptoms such as fever or dehydration is present. Treatment involves cough suppressants from your vet, or even antibiotics and fluids to treat secondary illnesses. Other illnesses such as heartworm may cause a chronic cough and exercise intolerance and should be looked for if your dog is not already on a heartworm preventive.

Small dogs are also prone to a condition called collapsing tracheas, and Cavaliers are very prone as a breed to heart and lung issues. Collapsing tracheae often cause a gasping or hacking cough when excited or active, and may require treatment if they become problematic. Heart and lung problems such as heart failure or genetic abnormalities can also cause coughing as a sign of the illness. Your vet can perform a complete exam to check the health of the lungs and heart.

Q. My 15 year old feline has a body odor. I have given her a bath and tried using dry shampoo but it doesn’t last long. Is it the food? She just stinks.
ANSWER : A. Food can sometimes cause body odor, however checking other areas of your cat’s body such as her teeth and gums, and ears may give you an answer. Body odor can also occur in cases of chronic skin infections and even some metabolic/organ based issues. Ears that have infection or mites, and teeth that have heavy plaque buildup may also cause an odor to appear. Scheduling a veterinary checkup and having your vet take a look at your cat to rule out any health issues is a good idea, and if none are found, then looking to the food as a cause of odor and changing to a new diet may be beneficial.

Q. My dogs skin has become red the vet said its an allergy to fleas yet he has none could it be an allergic reaction to my new carpet.
ANSWER : A. Skin problems can have a variety of causes, sometimes more than one. It is important to have the problem checked by your vet to determine if there is a medical cause for your pet’s skin issues and treat accordingly.

In pets of all ages, fleas, food allergies and exposure to chemical irritants such as cleaners and soaps can be a cause. Any one of these may not be enough to trigger the breakouts, depending on how sensitive your pet is, but a combination can be enough to start the itch-scratch cycle. Finding out the cause and eliminating it is the best course of action. With flea allergies, if your pet is sensitive enough, a single bite can cause them to break out scratch enough to tear their skin.

Check for fleas with a flea comb. Look for fleas and/or tiny black granules, like coarse black pepper. This is flea feces, consisting of digested, dried blood. You may find tiny white particles, like salt, which are the flea eggs. Applying a good topical monthly flea treatment and aggressively treating your house and yard will help break the flea life cycle.

If you use plastic bowls, this is a possible cause for hair loss, though this tends to be on the chin, where their skin touches the bowl while they eat. If you suspect this to be the culprit, try changing the bowls to glass, metal or ceramic.

Food allergies are often caused by sensitivity to a protein in the food. Hill’s Science Diet offers some non-prescription options for sensitive skin as well as prescription hypoallergenic foods for more severe cases. Royal Canin carries limited protein diets that may also offer some relief. Your vet can recommend a specific diet that will help.

If there is no relief or not enough, consider getting your pet checked by a veterinary dermatologist and having allergy testing done.

Q. My dog is bleeding out of rearend after
going to vet for a leg trouble the vet says
it is stres
ANSWER : A. It could be many things causing the problem. If it is an unneutered female it could be a season, if it is in the urine it could be a cystitis which could be set of by stress amongst other things. It could be from the anal glands or it could be from the lower intestinal tract. If it is the latter I would be careful what pain relief medication you are giving as some can cause bleeding in the GI tract such as meloxicam. I would recommend having a recheck with your vet to establish where the bleeding is coming from as some causes may require treatment or a change in current treatment.