Wow, that sounds awful! If the house comes with a yard, the tenants are either expected to look after it, pay someone to look after it, or their rent is increased to cover the cost of a gardener. In any case, I expect our tenants to look after the place as if they owned it, it is their home while they're there after all.

I've been quite lucky, never any of the issues you've described even with them having a large dog there. When we went to inspect the plumbing they took the dog for a walk. It was a kind of late notice inspection but the place was neat. The front and back yards look better now than when we lived there!

If I were you I'd be complaining about the general condition of the place, especially the toilet, and give them until the next pm inspection to have the back yard back in order.