Everything that Shell said is great advice. Definitely have the dog groomed and bathed before your brother's visit! That often helps people with allergies.
Not sure about the humidifier, but I sometimes run a diffuser with essential oils like Chamomile, Lavender, Niaouli, or Fir Needle to help with some of the symptoms of allergies. It isn't a cure all, but it helps.
Not sure about the humidifier, but I sometimes run a diffuser with essential oils like Chamomile, Lavender, Niaouli, or Fir Needle to help with some of the symptoms of allergies. It isn't a cure all, but it helps.