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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years and I'd like to help with your question.
Occasional vomiting in dogs, especially if they are still willing to eat and drink isn't always a serious problem, but when they have vomiting and labored breathing together it does suggest something serious. Chlorine powder is very caustic to the mouth, esophagus, and stomach and could definitely cause the symptoms that you are seeing. It can cause painful ulcers in all these areas and could potentially lead to the low grade fever that you are seeing. It sounds like you should seek treatment tonight and not wait until the morning. If she really licked chlorine then they can start her on some medications to coat and protect her stomach. Is there an emergency veterinarian you can take her to tonight?