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Hello. Thanks for the question.
With rattlesnake bites, the best option is antivenin. If that's not an option, then Benadryl and steroids can be used.
I would give oral Benadryl at a dose of 1-2 mg per lb body weight. It can be given every 6 hours I would give it for a good 6-8 hours.
With injectable Dexamethasone, I would give a dose of 0.2 mg/kg (0.1 mg per lb) sub Q/ under the skin every 12-24 hours for 3 days.
I hope this helps, let me know if you have any other questions.