danisgoat
Moderator
I am VERY glad to hear that you are taking him to the vet. Please let us know what the vet says.
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I would have any dog that spikes a temp like this seen by a vet, no matter if it comes down. Dogs with Lyme frequently spike temperatures, and you said he'd been quiet or lethargic. It's also Friday and if he gets worse tomorrow I'm guessing it will mean the emergency vet, so I'd definitely get him checked today.
Just getting to this post and glad that you are taking him to the vet to find out what is wrong. Did he maybe eat some thing he should not have outside?