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Did the landlord have a restriction in your lease about having a dog?
Or did they just tell you to get rid of the dog?
And you then agreed to remove the dog from the property?
Ok, unfortunately, if your specific lease didn't allow dogs then legally she could force you to remove it or consider it a breach of the lease and evict.
However, while it may be unfair, there is nothing that would prevent the landlord from allowing the "friend" to have a dog if she wanted to. There is no law that says that all tenants have to have leases that state the exact same rights in them. The landlord can allow one tenant to have a pet while denying another as they set the pet rules.
So I am sorry, but I don't see any violation of the law here that would give you grounds to sue the landlord for enforcing your lease terms and making you get rid of the dog.
I am very sorry that I don’t have better news, but please understand that I do have an ethical and professional obligation to provide customers with legally correct answers based on my knowledge and experience, even when I know the answer doesn’t make the customer happy...