Apartment Trespassing

My question involves criminal law for the state of: MD

So I live in an apartment complex in the middle of a city and there is nowhere to walk my dogs. There is a senior citizen apartment/condo's nearby that has a lot of grass, so I take my 2 little puppies down there. I ALWAYS clean up after them, but apparently there are other people that do not. While I was walking them today I was harrased by a resident, not the owner, of this complex and was told that he was going to "lock me up for trespassing". Now I left but not happily. If there are no signs that say no trespassing and its an apartment complex that allows dogs, can they really do anything? I am not being disruptive or causing any damage. Thanks :)

Yes, management of the apartment complex can. It is PRIVATE property, so if any of the residents complain to management, and management asks police to give you a trespass notice, you can be arrested for returning. It doesn't matter that other people walk dogs there or not, it won't impact law enforcement ability or willingness to act on YOUR presence on the private property in question. Disruption and damage are irrelevent to the issue.