Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This does sound concerning for Romeo. Yes, this could possibly be a snake bite. Some of the indications it is a viper bite is there will be one to two small bleeding pinpoint (almost like dots of blood on the skin) areas and surrounding that the area will be very very swollen. He will probably also be incredibly painful to the point he may try to bite you, if you touch. The swelling will be marked within the first 60 minutes (sometimes swelling 3 to 5 times normal).
All viper bites are a medical emergency, especially in Texas. If you think this is really a snake bite, then I must advise, even if it might be an hour's drive to take him to be seen now on emergency. These can be rapidly life-threatening, depending on the type of snake. Anti-venin may be needed, especially if this was a rattlesnake.
The bad news is there is no over-the-counter easy solution for this. You can administer benadryl (diphenhydramine) to perhaps help a bit but this is not a treatment that works. There are no safe pain relief drugs for this particular problem that I can recommend (do NOT give ibuprofen, acetaminophen or naproxen; aspirin does not work well in these situations and could potentially exacerbate bleeding issues that are associated with some snake bites). Most of the time these are so painful you really cannot touch the area without him trying to bite you, and topically there is not much you can do. You cannot suck out venom; this is a myth. It will not help to soak the paw and whatever you do, do not put any incisions into the skin.
If this has not remarkably swollen like I said above, you see no solitary bites and it is not painful, then this is probably not a snake. Perhaps it is a bee sting or other insect and then Benadryl may be helpful (1mg per pound every 8 hours), but even then if the swelling becomes severe the vet needs to administer a steroid injection.
If you want to read more about snake bites: http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=2111
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