My son was looking into rehabbing squirrels. He loves them so much. We have a ton of them at our new house and that has only strengthened his attachment

He is interested in rescue and rehab. However he is convinced he will need to take the rabies vaccine to do it. He has reacted poorly in the past to vaccines and so this is dissuading him. Wondering if any one could shed light on if the rabies vaccine is required or recommended for squirrel rehabbers? Hoping your input will encourage him