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.My name is ***** ***** I have been a Vet tech for 35+ years. I just signed on and was asked to assist you.
What you are describing sounds like a serious infection in the leg and needs to be seen by the Vet. This is an infection from what you described and can be septic. This is not something you want to wait to see the Vet with. It may be related to the other issue that you were into the Vet for.
I do urge the dog be seen as soon as Reasonably possible. You can try soaking in warm water and epsom salts, but there is something going on either in the bone, muscle or fleshy are of the leg that needs to be treated hands on.
Swelling from an injury usually appears in the first 24 hours. It is possible an injury, but sounds more like a bite or an infection. Try the warm Epsom salt soak and see if takes some of the inflammation out from the leg. I would still have it looked at, as it could be a pider bite.
Insect bites can cause the swelling you have described. As mentioned the warm soak in epsom salts for the leg should help with inflammation, swelling and heat.
I am in Florida annd after Irma we had to set spider traps and spary. We have seen some exceptionally large spiders and that would definately cause what you have described because of the venom.
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