Sorry for the loss of your dog.
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Maybe Blasto? Typically more of a problem up North. The suddenness of it almost sounds like he may have ingested a poison/contaminant. Hope they ain’t putting out that Warfrin based poison in yalls area. Hope you figure it out.
https://amp.hillspet.com/dog-care/healthcare/blastomycosis-in-dogsSent from my iPhone using Tapatalk