Lease Renewal and Issues in Pittsburgh

[Ryan Johnson]

Hi, Bigger Pockets. 

I currently own a duplex and have tenants from the previous owner who plan on renewing after their year lease is up. They are decent tenants who pay rent on time. Here are my issues: 

1. The previous owner only asked $600 in security deposit for rent that is $945.  Should I ask them to make up the difference, if they stay.

2. They have a dog and didn't pay a pet deposit or additional pet fee per month. I don't love that the have a dog in a duplex, but willing to let them stay. I normal would require $295 non refundable deposit and extra $25-$35 a month. Would you enforce those fees on new lease?

3. I would like to raise the rent 5% to $980. Does that seem reasonable? 

4. How can I avoid these issue on my next purchase?

Thanks,