New tenant - dog has allergies

[Mike M.]

What would you do in this scenario?

Tenant just moved into the house and is complaining that his English bulldog is have a severe allergic reaction to something (undetermined if it’s inside or outside the house)

Note, last tenant we had smoked weed in the house but after they moved out we had a remediation company come out and scrub and wash all walls and all surfaces. 

I really don’t want to do any duct cleaning because I’m concerned that could damage the flex ducting.

Is this my responsibility to deal with? Never had to deal with this scenario before.