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Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
I am sorry Winston is experiencing this. However, breathing issues is not a complication of Clavamox. It can cause vomiting, diarrhea or loss of appetite. An acute allergic (anaphylactic reaction) probably would have occurred after the first dose, and would have resulted in severe, life-threatening breathing issues which would have necessitated a trip to the ER.
Is he on any other drugs like prednisone because that can cause increased panting as a "normal" side effect?
IF he is on no medications other than the Clavamox, then I highly recommend you contact your veterinarian today and have him seen. This makes me worry there is something going on with his chest that might need a medication other than Clavamox. He might need chest X-rays.
If he is very much having trouble breathing- open mouth panting and worsening,and we think this is related to the antibiotic then it would be an anaphylactic reaction which is very very uncommon in dogs. IT is also a medical emergency and he must be seen immediately. This is the typo of reaction people must carry epi-pens to treat, although I do not advocate even if you have one to give to dogs because the dose is way too big.
If you think he is eating/drinking and acting pretty normal other than panting, then this is really unlikely to be an allergic reaction to the medication. However, if your vet is open this morning, then give them a call to alert them to what is going on. I do not know why you are using the antibiotic and if it was to treat a reparatory problem, then this may mean he is worsening and needs a radiograph (X-ray) to evaluate his chest.