It is best to have them agree to this early on during lease signing rather than them take the route so many tenants are taking by claiming it as an ESA (emotional support animal, which is considered a service animal -- no additional fees can be charged for ESAs).

Don't be emotional about it, just stop talking and listen, its important to be successful.

It can be a bit of an emotional rollercoaster at times. 

From my reading of the OP, it sounds as if this owner is being too emotional regarding this house.

I understand your emotional attachment to the house, but it is no longer yours.

People are more appt to become emotional and join together if there is a common enemy.

Don't let emotions play a part in your decision.

There is a good chance I'm being biased here as it happened to me and I was a little emotional about it.

Rich Dad, Poor Dad was great for understanding the rat race and the general philosophy of getting ahead but I have to admit the single most inspiring book I've ever read is Think and Grow Rich.Think and Grow Rich has detailed steps to harness the power of your brain, applying emotions to your goals and even to harness the power of your sex drive.

Symptoms are not just respiratory, but involve the entire body system, causing minor and major illnesses, minor to major damage to one, several, or all parts of a body, including mental/emotional/social and financial.