Experienced and professional animal trainer provide their insights in answering this question :
A. Panting is sometimes a sign of pain and distress, in absence of other symptoms I would try to keep your dog comfortable and monitor her for a few hours. If restless, not improving, have her checked over.

How to Identify Common Pet Problems ?

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Allergic reactions

Some signs of an allergic reaction to antibiotics for dogs are: Excessive salivation. Skin rashes. Difficulty breathing.

EFFECTS OF TOXICITY

Extremely high doses of amoxicillin may cause inflammation and damage to the kidneys or even formation of crystals in urine and subsequent kidney failure.

Amoxicillin-clavulanic acid may cause stomach upset, vomiting, and diarrhea. If stomach upset occurs, try giving the medication with food. These signs may go away during treatment; if they continue, contact your veterinarian.
Are there any potential side effects? Gastrointestinal upset in both dogs and cats has been reported, including vomiting, diarrhea, and occasionally bloody diarrhea in dogs. Cats may experience drooling and lip smacking after taking the medication.
If he is breathing faster or heavier than normal, it would be best to have him seen right away by a veterinarian. They will be able to examine him, take x-rays if needed, and see if something is going on with his heart or lungs. If so, they will be able to help get treatment for him.
Antibiotic Allergies

A more severe allergic reaction, called anaphylaxis, is a life-threatening medical emergency that requires immediate medical attention. Anaphylactic reactions due to antibiotics may include: Shortness of breath. Wheezing.

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.
Amoxicillin is a safe oral, antibiotic often prescribed by veterinarians for bacterial infections in dogs. Amoxicillin is well-tolerated by most dogs, but common side effects may occur, like diarrhea, nausea, stomach pain, skin rash or allergy.
Vomiting is the most likely effect with an overdose, but large overdoses of amoxicillin/clavulanate can be serious and can cause damage to the nervous system and liver. If you witness or suspect an overdose, immediately contact your veterinarian or an animal poison control center for further advice.
DOSAGE AND ADMINISTRATION:

Dogs: The recommended dosage of CLAVAMOX CHEWABLE Tablet is 6.25 mg/lb of body weight twice a day.

Clindamycin is used to treat certain types of bacterial infections, including infections of the lungs, skin, blood, female reproductive organs, and internal organs. Clindamycin is in a class of medications called lincomycin antibiotics. It works by slowing or stopping the growth of bacteria.
Side Effects of Clavamox for Dogs

As with any medication, some dogs may have an allergic reaction. Dogs with a history of allergies to penicillin should not take Clavamox. Discontinue giving your dog Clavamox and call your vet immediately if you suspect your dog is having an allergic reaction to this medication.

Physical Contact. There is probably nothing more soothing to an anxious dog than its owner`s touch. Try to identify the signs of anxiety in your dog and nip them in the bud as early as possible by picking them up, cuddling on the couch, or giving them a good long petting session.
In rare cases, people may experience potentially life threatening side effects when taking amoxicillin. Examples of these include: problems breathing. wheezing.
Common side effects of antibiotics can include rash, dizziness, nausea, diarrhea, or yeast infections. More serious side effects include Clostridioides difficile infection (also called C. difficile or C. diff), which causes diarrhea that can lead to severe colon damage and death.
The FDA-approved dosage is 20 mg/kg/day (Max: 750 mg/day) PO divided every 8 hours or 25 mg/kg/day (Max: 1,000 mg/day) PO divided every 12 hours for mild to moderate infections and 40 mg/kg/day (Max: 1,500 mg/day) PO divided every 8 hours or 45 mg/kg/day (Max: 1,750 mg/day) PO divided every 12 hours for severe …
Amoxicillin fights infections in the body within an hour after taking it. The penicillin-based medication gets its strength from consistent use of multiple doses per day. Amoxicillin often relieves symptoms in less than 72 hours and stays in your system for 24 hours.
Clarithromycin is as potent and effective as any other antibiotic when taken in a dosage of 500mg. With its very mild side effects, Clarithromycin is available both as a liquid and a pill to fight an array of bacterial infections.
Dosing instructions

Amoxicillin is dosed based on your dog`s body weight and what infection your vet is trying to treat. A typical dosage used by many vets is 5 to 10mg per pound. This means a 50-pound dog would need to take 500mg twice a day. This is usually given for 10 to 14 days.

Human Amoxicillin Not the Same as Pet Amoxicillin

Some of these ingredients, says Mahaney, include artificial flavors, colors, and chemical preservatives.

Antibiotics can cause lethargy, nausea and/or a loss of appetite, which may make your pet less interested in eating their food. It is crucial that your pet continues to eat, because their body needs the energy to continue fending off an infection and repairing damaged cells.
It is important to note that amoxicillin is also a prescription medication for humans, frequently with dosages and side effects different from those prescribed for your pet by a veterinarian. Due to possible side effects, pets should not be given any medication prescribed for humans.
When antibiotics are ingested in toxic amounts, it can result in mild to severe signs ranging from gastrointestinal signs (e.g., drooling, vomiting, diarrhea, inappetance, discolored teeth), metabolic signs (e.g., skin lesions, liver failure, kidney failure, etc.) to central nervous system signs (e.g., tremors, …
Ingestion of excess antibiotics often leads to gastrointestinal effects like vomiting, diarrhea, drooling, and loss of appetite. Some overdoses can lead to central nervous system effects like seizures or tremors. Contact a professional for advice if your dog gets an overdose of antibiotics.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. I gave clacamox 62.5 mg to my 7 lb pomareniam and she has been panting since should I worry
ANSWER : A. Panting is sometimes a sign of pain and distress, in absence of other symptoms I would try to keep your dog comfortable and monitor her for a few hours. If restless, not improving, have her checked over.

Read Full Q/A … : Clavamox for Dogs – VetInfo

Q. My dog has Addison’s Disease and is panting alot, is this normal?
ANSWER : A. I don’t typically associate panting with Addison’s disease. I do see panting (it’s a primary symptom) of the disease that’s the opposite of Addison’s disease, which is Cushing’s disease. Cushing’s disease involves having an overactive adrenal gland, as opposed to a non-active or under active adrenal gland. Panting can also happen with steroid administration. If you’ve upped the dose of prednisone that your dog normally takes to combat holiday stress that may be the cause of the panting.

Panting can be a sign of stress, so evaluate the environment and see if there’s something that could have your dog agitated – fireworks, small children visiting, etc. This is especially important with an addisonian dog, as I’m sure you know.

Other causes of panting could include primary respiratory problems or heart disease, since low oxygen states can trigger panting. Definitely mention this to your vet (a phone call isn’t a bad idea) for this reason, just to see if he’ like to examine your dog to make sure everything’s OK>

Q. I gave clacamox 62.5 mg to my 7 lb pomareniam and she has been panting since should I worry
ANSWER : A. You should report that to your vet. If you will notice breathing difficulties, head oedema, lethargy, general rash see a vet as soon as possible.

Read Full Q/A … : Clavamox for Dogs – VetInfo

Q. How many mg of iron in my dogs dry food is good? I’m campaign foods, one says 130 mg, another 170 mg and the last 230 mg. Are these safe?
ANSWER : A. Depending on how many of those 130, 170 and 230 mg per Kg of food and how many of that food per day are you giving your dog. Send me all the details and I will let you know if they are correct.

Q. My dog is panting, is this normal?
ANSWER : A. There are many reasons why your dog may be panting. It could be as simple as feeling too hot, having been running around a lot, or being anxious about something. If it is due to feeling hot or running around, move your dog somewhere cool and provide access to plenty of water. If you believe anxiety is the cause, you can try pheromone diffusers or collars, which work very well.

Finally, consider that panting can also be a sign of pain, a respiratory issue or a heart problem. So, if your dog is panting during an extended period of time, veterinary treatment should be sought immediately.

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. How do I FINALLY rid all 4 of my cats of tapeworms after 2 years of dealing with it? Fleas seem to be controlled. I know they are the vector.
ANSWER : A. If your cats keep getting tapeworms, then they are picking up fleas from somewhere. Fleas will hitch a ride on your pant leg from outside.

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.

You can also 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 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 life cycle.

Q. My pet dog is vomoting yellow and white foam since since two hours. Almost 7 times vomited. What can I give him to comfort him.
ANSWER : A. This amount of vomiting signifies that your pet has a severe case of gastritis (inflamed stomach). I am unsure if just over the counter products will help him, but you can try
1) Famotidine (Pepcid AC)- @ 0.5-1 mg/kg every 12hrs (1kg=2.2lb to help with your dosage calculation)
2) Bland diet- boiled plain chicken and rice or cottage cheese, or Low fat food like Purina EN Gastrointestinal
3) Pedialyte- as needed to help keep him hydrated

If your pets symptoms are not improving within the next 12-24 hrs then he should see a veterinarian for this. Poor guy may have eaten something he shouldn’t have and at this rate he is at risk to getting severely dehydrated. The vet should check him over and also may want to run some tests to ensure an underlying disease process isn’t the cause of his sudden illness.