I was speaking to a lawyer in the area to sue him, and she mentioned that he is well known by the police and the prosecutors for having bunch of misdemeanors and other legal related issues.

You could also get the police involved.

If I had someone sell me there house and then didn't leave I would call the police and have them arrested for trespassing.You have title insurance so you don't have anything to worry about.

Why haven't you called the police?

bank teller slid box to collect rent and bullet proof glass  razor wire around the parking area.At the properties we were funding and they were rehabbing is where I learned a ton.. this company had retired Police officers at most jobs checking in the subs you worked on the property you had to show ID and sign in.. ( I asked him why and his answer was a large amount of the theft in those days was workers coming back at night and stealing) so he said having them check in really cut down on it.. the other tid bit was the first thing they would do is paint the copper pipes Grey .. reason he said is if the copper thieves come in they will think its galvanized and leave it be. 

As it currently stands, it can sometimes take hours for a police officer to respond to a disturbing the peace call, especially on a Friday or Saturday night.  

That kind of thing, but it will be a warning first.They will find you if one of the neighbors complains loudly enough that there are big parties and disruptions happening at the address and the police get called.

The former owner even called the police and now my client is dealing with a burglary charge.

These dogs are not being policed by their owners, and that is creating a liability for you.Simultaneously with the notice to cure, I would also memorialize in writing your conversations and concerns about the dog to your tenant and send them a certified letter. 

I'd start the conversation with something like,  "I guess there was some miscommunication and my attorney said that before we got the police involved, to see if it can't be sorted out in a friendly fashion, so here we are".