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It sounds more like heat related symptoms. If his tongue or gum are white, he could be having a heat stroke. I suggest that you take measures to cool him off immediately. Use ice chips in his mouth and cold water ran through his fur. Soak him in a cold tub if you can.
If you can't get his temp down, you need to rush to your vet right away.
Let me know if you still have questions.
You still need to cool him down, I think.
You can take his temp rectally to get a good idea of how to proceed. Normal temp for a dog is 102.5.
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How is he doing now?