Of course not, but there's no way to predict any cat's reaction to a new environment or what might upset them later on. My cat didn't mark until 2 years in.

I'm just saying that if you signed a lease, then you should hold up to the agreement. It has zero to do with who owns the property or how long they have owned it or how long a renters has lived there. A lease is a legal binding contract.

To me, the bigger point is that the landlord is under no obligation to change a legal contract just because a tenant decides they now want a pet. The tenants knew the terms of the lease before signing it. They wouldn't like the terms suddenly being changed and then crying how it was unfair. There's a sense if responsibility that comes with living up to an agreement that also applies to owning a pet.

I wouldn't want to make a tense situation with a landlord if I liked where I lived. All it does it start giving them reasons to look to get you out. Just me, but, YMMV.