In the future, make sure language in the lease addresses this.You want to avoid having a tenant work on your property for a few reasons: The work may be done poorly and you'll have to redo it; the tenant may become injured doing the work and bring a lawsuit against you; it muddies the waters of your  existing relationship.The most I allow my tenants to do is change out the smoke detector batteries if needed- even that is in the lease.Good luck!

So,  for example, if someone injured themselves on the property they would claim on the renter's insurance.

One injured or dead person (especially a child) that didn't have adequate exit or means of escape or lack of safety features etc. will bankrupt both businesses.

I would never allow a tenant to do work on my properties, not only for liability reasons if they get injured; but, how could I hold them to the level of quality I expect. 

A guide dog for the blind is basically a dog that can do the same 30 tricks over and over again with 100% reliability (or a blind person could end seriously injured or dead).But, the flip side... is that they are very trainable dogs.

The criteria for taking a case involves somebody actually being injured and the other party having something worth going after.

Neighbour As dog caused the fight, Neighbour A was injured as the result of a dog fight caused by the fact that their dog was not under control.

To apply this to flowers; if the profit a prendre was for flowers and the individual had set up a flower shop, and your denying access to the lawn injured that flower shop, you are liable for the damages to that flower shop.The amount of damages you could be on the hook for are wildly fact dependent.

At the most basic level, if the tenant's dog injures someone the injured party is going to sue you as landlord.

But I'm very careful to check the recalls on Ikea's dressers -- there have been incidents where children have been injured or died when a dresser they were climbing fell on them.Other reasons that I have not rented to prospective tenants with children is due to the hazards of a fireplace (woodburning -- obvious hazards;  gas fireplace -- can be burned if touching the hot glass; electric fireplace -- with the one in my personal residence, you need to be very careful when removing the glass, as it shatters very easily.)