Experienced and professional animal trainer provide their insights in answering this question :
A. Make sure you mention it to your vet and every vet that you are going to see in the future and that it is written down on his records. He may also need some treatment for the reaction, I am sure he is uncomfortable ! Symptoms may also get worse as times goes by with other reactions and secondary events. I would definitely recommend to have him checked over.

How to Identify Common Pet Problems ?

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The side effects that antibiotics cause, says Dr. Carlson, include the very uncomfortable leaky gut syndrome, diarrhea, vomiting, itching skin, yeast infections, behavioral issues, and more.
While these reactions are uncommon, antibiotics do tend to cause more allergic responses in dogs than any other group of drugs. Most symptoms are typical of other histamine producing allergies; dogs may develop an itchy rash, and watery eyes or nose. Swelling of the face or even the respiratory tract is possible.
Swollen faces, hives, vomiting, trouble breathing, collapsing. These are the most common symptoms of an allergic reaction. Just like people, pets can have allergic reactions. And just like people, in rare cases an allergic reaction can progress to an anaphylactic reaction which can be life threatening.
Look like small (less than ½ inch) widespread pink spots in a symmetrical pattern or slightly raised pink bumps. Usually appear on day 5-7 (but can be earlier or as late as the 16th day) from the start of the Amoxicillin or Augmentin, but can occur at any time during the course of the medication.
A non-allergic rash occurring while taking amoxicillin or Augmentin will: Look like small (less than half an inch) widespread pink spots in a symmetrical pattern or slightly raised pink bumps.
Prescription antibiotics can cause temporary hair thinning. Antibiotics can deplete your vitamin B and hemoglobin, which disrupts hair growth. When hemoglobin is too low, you can become anemic and lose hair as a result. Normal levels of vitamin B are also critical to maintaining healthy hair.
Call your doctor right away if you have a skin rash; itching; shortness of breath; trouble with breathing; trouble with swallowing; or any swelling of your hands, face, mouth, or throat after you or your child receive this medicine. Amoxicillin may cause diarrhea, and in some cases it can be severe.
Toxic epidermal necrolysis is a life-threatening skin disorder characterized by a blistering and peeling of the skin. It can be caused by a reaction to medication, most often from antibiotics or anticonvulsives. The condition causes the skin to peel in sheets, leaving large raw areas.
Topical antibacterial soaps and shampoos can help such as KetoChlor Shampoo or Malapet Shampoo. It is often necessary to shampoo pets once to twice a week, while also using any prescribed antibiotic therapy for maximal chances of recovery. We`ll contact your Vet to verify.
The most common symptoms of an allergic reaction in your dog are: hives (patches of red, swollen, itchy welts or bumps) also known as urticaria. facial angioedema (muzzle or eye swelling) itching.
A true amoxicillin allergic reaction will cause an immediate onset (usually within an hour of a dose) of rash/hives, swelling, shortness of breath and even anaphylaxis. This is called an IgE mediated reaction.
Treatment of an ampicillin or amoxicillin rash

A maculopapular rash may take one to two weeks to go away and may get worse for a few days once the drug is stopped. General treatment recommendations include: stopping the medication. giving oral antihistamines (e.g., cetirizine) for itch.

Rare side effects of amoxicillin

problems breathing. wheezing. hives. itching.

Even often used antibiotics such as Penicillin, Cephalexin and Erythromycin are known to cause hair loss.
Gram-negative folliculitis occurs most often when a person uses oral antibiotics, particularly tetracyclines. It could also develop after long-term use of topical antibiotics, where antibiotic-resistant bacteria grow on different parts of the body, including the scalp.
Antibiotic allergic reactions

Rarely, some people may have an allergic reaction to antibiotics, especially penicillin and cephalosporins. In most cases, the allergic reaction is mild to moderate and can take the form of: a raised, itchy skin rash (urticaria, or hives)

If your child develops hives, you can treat the reaction with over-the-counter Benadryl, following age-appropriate dosing instructions. Don`t give your child any more antibiotics until a doctor sees your child. If your child has a rash other than hives, you can also treat them with Benadryl if they`re itching.
Antihistamines. Your doctor may prescribe an antihistamine or recommend an over-the-counter antihistamine such as diphenhydramine (Benadryl) that can block immune system chemicals activated during an allergic reaction.
Amoxicillin starts working within 1 to 2 hours after the first dose. Your dog`s condition should improve within a few days. However, be sure to give your dog the full course of antibiotics according to your veterinarian`s instructions to prevent reinfection and antibiotic resistance.
Often, no treatment is needed for an antibiotic overdose. Usually, you`ll need to watch for stomach upset and possibly diarrhea. In those cases, you should give extra fluids. Poison Control will stay in touch to be sure that there are no unexpected effects.
Dermal toxicity is the ability of a substance to cause local reaction and/or systemic poisoning in people or animals by contact with the skin. The absorption of toxic materials through the skin depends, to various degrees, on their chemical composition and solubility.
Treatments for infectious causes include parasiticides, antibiotics and antifungals. Often medicated shampoos, creams and sprays are recommended. If the itching has not resolved at this stage some more investigations will determine other possible causes such as flea allergy dermatitis or a food allergy.
When dog scratching gets out of hand, it is often the result of allergies to food or environmental triggers, including mold and pollen. Dogs may also develop a skin irritation called contact dermatitis when they encounter substances like pesticides or soap. Boredom or anxiety.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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. My dog is having ear problems. I have had her at two vets and they can not seem to find the cause. Can you help?
ANSWER : A. For a pet with chronic ear issues I would recommend checking her thyroid levels. Hypothyroidism can be a cause of chronic ear infections.

Then I would recommend having a bacterial culture of the ear debris to ensure the appropriate antibiotic is chosen to completely rid the bacteria in there. If there is resistant bacteria, the ear will appear to get better at first but then once ear meds are stopped they will thrive again and cause a re-emergency of the ear infection. Also longer treatment may be needed, for example instead of 7-10 days, perhaps 14 days continuously.

If all else fails, I would recommend a skull radiographs to look for signs of a narrow ear canal and/or an inner ear infection which will require not only topical antibiotic ointments put into the ear, but also oral antibiotics.
Most ear infections are caused by moisture in the ears, narrow ear canals, hypothyroidism or skin allergies. Each one has to be gone through systematically.

Q. I have two problems with my 16 yrs old dog: he’s constipated and has a ear ache. What can I use to relieve these?
ANSWER : A. Constipation is a common problem in dogs that can be due to a number of things. However it is a good idea to make sure the constipation is not actually diarrhea, as some dogs can strain after a bowel movement, making it look like such. If constipation is present, adding a little pumpkin puree or plain yogurt to the diet can help make digestion easier and make stools easier to pass. However if symptoms do not resolve after a few days, it is best to speak with your vet.

For ear aches, it is best to have your vet examine the ear as many things including allergies, ear infections, mites and more can cause ear problems. If the ear is just dirty, then cleaning the ear gently with cotton balls or a clean washcloth and a dog ear cleaning solution can help. Do not use Q-tips as a dog’s ear has a 90-degree turn in it and placing Q-tips in the ear can cause damage to the canal or inner ear. However if the problem persists or cleaning does not help, it is best to seek care.

Q. Dog has dry ears and it itches him. Any recommended soothing lotions??
ANSWER : A. I will answer this question as if you are speaking of the inside of the ears (not the external). Most dogs ears aren’t dry unless they have other skin issues such as skin allergies, which can be seasonal or year around and caused by many different things, such as foods, environment, dust, grass, pollen, and products (shampoos, perfumes, etc). Check in the ears for waxy build up. The ears should be clean of any wax and dry. If they have build up, I would take a cotton ball, and soak half of it in a dog ear cleaning solution. This solution should be made specifically for dogs, and your local vet would most likely sell the appropriate brand.

I would address any possible skin allergies, if they do not have any other skin issues, then looking inside the ears and cleaning with a good ear cleaner (should be alcohol free—because alcohol is very drying) If the ear scratching continues regularly then bring him/her into the vet to have a proper ear exam.

Q. Pup had reaction to amoxiclin, itching real bad,lost some hair around head, ears worst
ANSWER : A. Make sure you mention it to your vet and every vet that you are going to see in the future and that it is written down on his records. He may also need some treatment for the reaction, I am sure he is uncomfortable ! Symptoms may also get worse as times goes by with other reactions and secondary events. I would definitely recommend to have him checked over.

Q. My dog keeps shaking his head at night and is very anxious acting? We’ve cleaned his ears and putting ear drops in hasn’t helped?
ANSWER : A. It sounds like ear canal infection. I am not sure if you used ear drops to clean ears (they do not contain antibiotics) or ear drops from your vets to treat ear infection. In case you used ear cleaner only you should take your dog to your vets to get antibiotics. If you are using antibiotics drops and there is no improvement your vet may recommend taking a swab from the ear to check what bacteria, fungus or parasite is responsible for the infection and then pick the most effective medication.

Q. Can you use Floxin Otic for ear infections on dogs?
ANSWER : A. Floxin Otic is an ear cleaning solution designed for the clearing of ear infections in people. While it may be similar to dog products used for ear infections, it is best to bring it to your vet’s attention first so he or she can compare it to dog-safe products. It may be that it is in the same concentration and can be safely used, or your vet can instead recommend a product that is in the right formulation.

If you are seeing an ear infection in your dog’s ears, your vet can provide you with a dog-safe medication to use. Ear infections are usually treated over a period of ten days and involve cleaning the ear 2x daily and then placing the otic ointment in the ear to stay in place until the next cleaning.

Q. My mini rat terrier has an ear hematoma and I have opted to let it heal naturally so is there anything I can give him for the itching??
ANSWER : A. I am sorry to say but there is a good chance your pet has an ear infection which caused the ear hematoma in the first place. Therefore I recommend at least treating the ear infection with topical antibiotics +/- antifungala prescribed by your vet.
Your pet is itching because the blood-filled ear is causing pain and discomfort. The best course of action, which is still considered conservative treatment, is to have the ear drained by your vet and then they can prescribe steroids and potentially oral antibiotics. This is a lot less invasive than the mattress suture pattern technique that is done to fix these, and I have seen lots of patients ear hematomas resolved this way as well.