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You can try some benadryl as this makes them a bit calmer or you can try some over the counter melatonin as this helps to calm them down. Generally nail cutting is a fight with most dogs and if you can afford the ten dollars to have a vet tech do it at the office it is well worth it.
Benadryl and dosing: http://www.petplace.com/drug-library/diphenhydramine-benadryl/page1.aspx
using a dremmel