Cat urine smell problem

[Goran Kocev]

My tenant is complaining about cat urine small coming for other apartment that they share wall with . Not sure if that is possible but if it is what can be done about it from landlord prospective .

First really want to help the tenant ,

Second should landlord be responsible for something like that in the lease we have that we are not responsible for pest after the first month but this coming from outside .