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Hi, I can help you with your question today.
Decongestants are toxic to cats and dogs, so you can use those. Does Rusty go outside?
Have you introduced any new cats to the house? Any other exposure to unusual cats?
Hello I am Dr. RB and I am a small animal veterinarian. I have used some decongestants in dogs and cats with some success. I only typically recommend you try to use them if nasal discharge is clear ONLY for allergic sinusitis (e.g inflammation of nasal passages from inhalant allergies).. yellow and/or green discharge from the nose or from coughing indicates a bacterial or viral infection and decongestants will not help with this. For cats, I use Chlorpheniramine 4 mg every 24 hours.. Hopefully this will help you:)