Dean, it's reasonable to assume that the new addition brought an infectious agent into your kennel. The white spots near the tonsils need to be cultured in order to determine which, if any, pathogenic bacteria are present and, if so, which antibiotic is the best to address it. Lincosin doesn't have good efficacy against gram negative bacteria. A viral agent is possible as well but we don't culture for them. Instead, Blue's vet can perform a PCR canine respiratory disease panel which can detect the presence of canine respiratory coronavirus, canine adenovirus type 2, canine parainfluenza virus, canine herpesvirus type 1, canine influenza virus, canine distemper virus, and the bacteria Bordetella bronchiseptica. PCR testing is DNA-based; it's pricey but very sensitive.
No, I don't believe we should incriminate the canaries as carriers of disease to your dogs. Please respond with further questions or concerns if you wish.
It would be prudent to instill a broad spectrum antibiotic ophthalmic ointment into those eyes thrice daily for a minimum of 10 days. Terramycin would be a good choice: https://www.amazon.com/Peak-Marketing-Terramycin-Ophthalmic-Ointment/dp/B00063KGUK You might find it in a local pet/agricultural merchant as well.
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