Hi - my name is XXXXX XXXXX I'm a litigation
attorney. Thanks for your question. I'll be glad to assist you.
Unfortunately, a landlord is not the insurer of the safety of the tenant, and the landlord is not liable for the criminal acts of third parties. This means that your daughter can't claim that the lease has been breached because of a burglary.
Instead, in order to cancel the lease without penalty, your daughter would have to prove that the landlord did something to breach the lease. If there is a clause in the lease that states the landlord is responsible for providing security, and he negligently failed to do so, there may be a claim for a breach based on that. If no security is offered, then she would have to try to find something else.
Without proving some breach of the lease agreement by the landlord, the burglary itself is not grounds to breach the lease. Your daughter could find another person to sublease from her if the lease does not prohibit it or she would have to find a new tenant that the landlord agrees to take over the lease.
As for the dog being killed by rat poison, this also wouldn't likely be a ground to terminate the lease unless you could prove that the landlord knew it was there AND that he should have reasonably expected that her dog would eat it - - both of which are unlikely. Even if the landlord put it out, he'd likely not admit to it.
Your daughter could file criminal charges against the landlord if she believes he is responsible, but that also wouldn't be grounds to break the lease. But, it could give her some leverage to negotiate with.
The best option is to consult with the landlord, explain the concerns and try to reach an agreement.