As suggested above, I would start by carefully reading the lease.
You might want to consider offering your landlord some additional security deposit to hedge against the possibility of your dog damaging his property.
Most of the landlords I know are primarily concerned about protecting their financial interests. I love big dogs but they do have more potential (or at least a perception by some) to cause a larger amount of damage than a small dog. I am speaking about averages--all dogs are different and I have seen some toy dogs do major damage and GSDs do none at all. There is also a perception issue at work here.
What a landlord wants most is a tenant that pays on time, doesn't damage the property, and stays in the property for a long time. Each turnover costs money so by staying put you are increasing his margins. Hedge against increased risk from the GSD with a bigger security deposit and he might just drop the issue.
Best of luck to you.
Linus van Pelt Haus Juris CGC. My Sweet Babboo, born March 17, 2014.
Madeline Ronan Heart (Maddie) Dec 1997 -- November 22, 2013 Rescue GSD, Sable
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