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Good morning! Thanks for sending in your question - I'm Dr. Sara and I work exclusively with dogs and cats.
In an otherwise healthy dog who suddenly starts showing signs of pain (panting/pacing) and really licking one spot on their foot hard, my first suspicion is that they were bitten or stung by an insect or spider. Bee stings can be terribly painful and I've seen many dogs actually be non weight bearing lame (meaning that they hold up their entire foot and won't walk on it at all) from the pain. This actually happened to my own dog not too long ago - he was doing exactly as you described - panting hard, holding up his foot like it was broken, and licking excessively.
It's great that you'll be able to have him seen today - the vet will do a full physical concentrating on his foot. If they decide on physical that it's likely some sort of sting or allergic reaction, they may recommend treatment with benadryl or an anti-inflammatory to lessen the discomfort.
Hope this helps! Let me know how it goes :)
Thank you so much for the update - I'm glad to hear that he's feeling better! It's also nice to hear that my thoughts were on target too, haha. If my answer was helpful to you, please don't forget to give me a rating, as this signals to the website to give me a pat on the back :) Thank you so much!