Experienced and professional animal trainer provide their insights in answering this question :
A. Metronidazole is not licensed for veterinary use (at least in most of countries) so there is no minimum age that it should or should not be used from. However, it is true that it is better not to use it in young dogs unless absolutely necessary.

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Metronidazole is considered a safe medication for healthy dogs. However, some dogs should not take this medication because it can be harmful to their health. For example, pregnant and nursing females and young puppies should not take metronidazole.
Metronidazole should not be used in young puppies and kittens. Metronidazole should be avoided or used with caution, at reduced doses, in animals with kidney or liver disease.
Metronidazole (also known by the brand names Flagyl, Metizol, Protostat, Metrogel) is a strong antibiotic primarily used as an antidiarrheal to treat inflammation of the large intestine. It`s also used for other illnesses and conditions in dogs, cats, and horses, as well as to treat bacterial infections in humans.
Metronidazole should be avoided in the very young neonate. The high potential for neurologic side effects may be exacerbated by the blood-brain barrier permeability in neonates. Doses for treatment of giardia in older infant (2-6 weeks) and pediatric (6-12 weeks) animals have been published.
Metronidazole (brand name Flagyl®) is an antibacterial and antiprotozoal agent used in the treatment of certain anaerobic bacterial and protozoal infections, such as those caused by Giardia and Trichomonas. It is often used to treat diarrhea and other intestinal problems.
“Mild cases of diarrhea in both cats and dogs can be treated at home by feeding a bland diet such as boiled chicken or low-fat hamburger, and white rice,” says Miller. Cooked pasta is another option. These foods are easy to digest, so they give your dog`s GI tract a break.
If they have diarrhea, feed 1-2 cc of active culture yogurt and a couple of drops of KaoPectate. If they continue to have diarrhea, you may need to reduce their intake of milk for 1 to 2 feedings and/or substitute an electrolyte solution.
Does metronidazole kill worms in dogs? Metronidazole does not kill intestinal worms such as roundworms, hookworms, or whipworms. Metronidazole can be used to treat certain protozoal parasites such as giardia.
Also known by the brand name Flagyl, this drug is commonly used by veterinarians to treat diarrhea in dogs. Metronidazole can kill anaerobic bacteria (that`s bacteria that don`t need oxygen to survive) and cross the blood-brain barrier to treat some infections in the central nervous system.
Once puppies and kittens have reached 6 weeks of age, normal adult doses can probably be comfortably used for most antimicrobials.
4. Bottom Line. Metronidazole is an antibiotic that is particularly effective at treating infections caused by susceptible anaerobic bacteria and parasites. Alcohol and products containing propylene glycol should be avoided while taking metronidazole and for three days after stopping it.
Flagyl (metronidazole) might be used to treat diarrhea due to the anaerobic bacterium Clostridioides difficile (C. diff), but it is no longer the first-choice treatment for C. diff. due to rising antibiotic resistance.
Metronidazole suppresses the DNA enzymes that encourage these parasites to multiply. In theory, your dog`s gut should stabilize and return to normal function as a result. But the problem is that this relief is only temporary. Metronidazole doesn`t actually fix the fundamental issues causing your dog`s diarrhea.
Usually most diarrhea will run its course within two to four days, although in some cases, it can last longer. If there are any other signs of illness like vomiting, loss of appetite, depression, or pain, a veterinary trip is in order.
On average, uncomplicated diarrhea lasts for about 2-3 days in puppies. However, if your puppy has diarrhea for more than three days or is lethargic, vomiting, or has a fever, you should see a veterinarian immediately.
Antibiotics kill the friendly bacteria in your dog`s microbiome. And that can lead to long-term illness, disease and perceived allergies.
Amoxicillin may be prescribed in liquid or tablet form. The recommended dose for most dogs is 5 mg per lb. Most courses of amoxicillin are administered up to twice a day for 5 to 7 days, or for 48 hours after symptoms subside completely. If stomach upset occurs, give amoxicillin with food.
Dogs are vulnerable to a range of bacterial infections that can affect the respiratory system, skin, ears, urinary tract, and kidneys. Most bacterial infections can be quickly cleared up with the right course of antibiotics or anti-inflammatory medication.
Yes, puppies can take dog-specific probiotics. This may help them develop a balance of intestinal bacteria to support a healthy immune system and reduce the incidence of diarrhea, constipation, and infections of the digestive tract.
In a young puppy, diarrhea can be caused by viruses and parasites. A stool sample to the vet is a good idea to check for Coccidia (Coccidiosis), Giardia, Trichomonas or other infections. If your litter of two-week-old puppies gets diarrhea, it could be worms.
Young puppies are prone to parasites. Whether they are born with parasites or pick them up from the environment, parasites like roundworms, hookworms, whipworms, coccidia, and giardia all cause diarrhea in puppies and all require veterinary attention.
Metronidazole (Flagyl) is a popular antibiotic a vet may prescribe for a dog to treat diarrhea, inflammatory bowel disease, or infections. The most common side effect of metronidazole is diarrhea, even though it can be prescribed to treat diarrhea.
How long will my dog be on metronidazole? The usual treatment period is 5 to 7 days. However, your veterinarian may wish to extend that time if the infection is not responding as well as expected. It`s important to remember to give all of the doses to your dog on a schedule.
Pumpkin seeds are an extremely effective deworming agent because they contain an amino acid called cucurbitacin. This paralyzes the worms making them easily eliminated from the intestine. They can be fed whole as a treat or you can grind them into a fine powder and add to Fido`s food.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. On Metronidazole(flagyl)..it says on here not to give to young puppies..my girl is 10 1/2 weeks and my vet prescribed it for Bacterial infection…..
ANSWER : A. Metronidazole is not licensed for veterinary use (at least in most of countries) so there is no minimum age that it should or should not be used from. However, it is true that it is better not to use it in young dogs unless absolutely necessary.

Q. my 3 year old cat is going for her annual physical and her vet prescribed that she takes 10 mg 2 hours before since she is feisty. Is 2 hours good?
ANSWER : A. Benadryl is often prescribed for anxious or aggressive cats prior to a vet visit to help calm them. The usual dose is 1 mg per pound (or 10 mg if you cat is 10 lbs). An interval of 2 hours prior to the visit should be fine. However, please understand that Benadryl will not knock your cat out – just make it calmer, more tractable for easier handling.

Q. Is Folliculitis curable? Vet has me using hydrocortisone cream.
ANSWER : A. Folliculitis is usually a symptom of something underlying, as the inflammation is usually bacterial in origin. Systemic diseases that can lead to bacterial folliculitis include endocrine disorders (such as hypothyroidism and Cushing’s disease in dogs) and disorders of the immune system.

Skin disorders causing bacterial folliculitis in dogs include: canine acne, acral lick granuloma, skin fold pyoderma, interdigital pododermatitis (interdigital cysts), idiopathic furunculosis of German Shepherd Dogs, pyotraumatic folliculitis, and callus dermatitis, among others. In both dogs and cats, allergic skin disease is perhaps the most common cause of bacterial folliculitis. Parasitism and fungal infection of the skin are also common causes.

The diagnosis of bacterial folliculitis is typically made upon visual inspection and often after undertaking one or more of the following diagnostic tests:

Skin scrapings for mites

Skin cytology

Fungal culture

Wood’s lamp examination for fungus (ringworm)

Bacterial culture and sensitivity

Skin biopsy and histopathology

If the medication your vet prescribed does not improve the skin’s condition, make a recheck appointment with your vet for further diagnostics or ask for a referral to a veterinary dermatologist for a more extensive workup.

Q. I have a cat with that virur (aids) could u tell me about her disposition and care
ANSWER : A. Thanks for your question.

Unfortunately the discussion about what you asked has no straightforward answers and can be quite complex.

First thing that I would double check, considering that your cat is very young, is whether she is really infected. It is important to remember that kittens born to FIV-infected queens will receive antibodies from the queen via the milk, and so will test positive early in life though they may not be infected. Kittens with a positive test result should always be retested when they are 5-6 months of age.

Many FIV infected cats are able to live happily with the virus for a long period of time, and indeed the virus will not necessarily ever cause clinical disease.

Different factors will influence the onset of disease in your cat including:

– The ”subtype” of FIV your cat is infected with,

– Her immune response

– The presence or absence of other infectious agents.

To maintain a good quality of life for your cat, I will give you these general guidelines, but you will then find certainly helpful to speak with your veterinarian for specific cases.

– Some antiviral medications used in human patients with HIV infection have also been shown to help some cats with FIV infection. Interferons may have anti-viral effects and modify immune responses. A recombinant feline interferon (feline interferon omega) is available in some countries. Down side is the cost usually.

– Keep your cat away from other cats and possible source of infections;

– Maintain good quality nutrition;

– Keep your cat indoor if possible regularly checked by your veterinarian;

– Keep your cat away from non-infected cats.

Q. One of my pet’s ears seems very irritated. What I can use to clean it with?
ANSWER : A. Ear Irritation can be caused by a number of things ranging from allergies, ear infections or even mites. Dirty ears can also cause irritation and problems. Knowing the type of problem is best for figuring out how to treat it.

For plain dirty ears that do not have any odor, redness or leakage of discharge/debris, a simple over the counter canine ear cleaner can be used. Gently soak some cotton balls or a washcloth with the cleaner, and then use these to wipe out the flap of the ear and opening to the ear. Do NOT use Q-tips as these can become stuck or lodged in the curve of the ear canal and may cause injury to the ear drum.

If the ear is bright red or itchy without any dirt or debris in it, it may indicate an allergy. Sometimes an allergy medication can help provide relief in this situation. Your vet can give you the correct dosages of an over the counter allergy medication to use, or may recommend one specifically for dogs.

For infections and mites, changes to the ear such as bad smell or lots of debris and discharge, flecks of black or brown debris, or scabs and sores in the ear may be present. In these cases, it is best to have your vet take a sample of the ear debris to test for mites or infection. Your vet can then give you an ointment that is placed and left in the ear between ear cleanings. Most vets will then recommend cleaning the ears twice daily and then leaving in the ointment after for a period of ten days.

Ear mites ARE contagious to other pets, so if your dog does have them, it is best to treat any other pets in the house at the same time to prevent the mites from spreading around continuously.

Q. I have a pup that haven’t been 2 1.2 months old eating good for week. I have worm her once a week since she been 2 weeks old.
ANSWER : A. It is recommended to worm a puppy every 2-3 weeks initially and then every 2-3 months so you don’t have to give her worming medications every week any longer.

Q. OUR VET looked and SAID YEAST INFECTION IN CATS EARS. SHE HAS HAD 10 days Tresaderm and 2 treatments B N T.something still going on….
ANSWER : A. If your cat still has an ear infection after treatment then your vet may need to do a culture and sensitivity to determine the exact organisms present and the appropriate medication needed. Some infections can have organism that are resistant to certain medications. A culture and sensitivity would provide that information. Take your cat in for a recheck and ask about doing a culture and sensitivity test, especially if the infection hasn’t improved much. If there has been some improvement than your vet could treat longer with the tresaderm to see if it would resolve.

Q. My cat is pooping outside of the litter bix. He is 2 1/2. He did this as a kitten. It stopped then started about 3 months ago. Litterbox is clean.
ANSWER : A. Inappropriate elimination or house soiling can be a frustrating problem but with a bit of detective work on your part, there is hope. First, before deciding that this is a behavioral issue, any medical problems (diarrhea, constipation, fecal incontinence, pain on defecation, etc.) need to be ruled out and/or treated. If your cat receives a clean bill of health from your vet but is still eliminating outside the litterbox, then we need to consider that something about the box itself might be aversive to your cat. Cats can be quite finicky about their litterbox and toileting habits. Below I have listed common recommendations and cat preferences for litterbox use. Review the list and make any changes that could account for your cat’s aversion to defecating in the litterbox:
* Soft, fine-grained clumping litter (vs, coarse-grained, non-clumping litter)
* Unscented
* 1 – 1 1/2 inch depth (especially older cats or cats with hip problems)
* Larger pans (especially for large cats) – want to get whole body inside – poop just outside the box might mean the box is too small
* Open, non-hooded
* At least one shallow side to get in and out easily
* Easy to get to – not hidden away, preferably in areas they spend time in or near – and not near appliances that make scary, unpredictable noises (washers, dryers, refrigerators)
* Scoop minimum 1X/day – preferably 2
* Clean the litterbox with soap and water and put in fresh scoopable litter at least once/month (instead of just continuously adding)
* Some cats prefer to urinate in one box and defecate in a separate box, so you may need 2 boxes even if you just have 1 cat. Multi-cat households should have 1 box/cat plus 1 extra.