loss
Verlust is the German word for loss. It is used to describe the state of no longer having something, whether it be a material possession, a loved one, or an abstract concept such as hope or faith. It can also be used to describe the act of losing something, as in 'Ich habe mein Handy verloren' (I have lost my phone).
The loss of your pet can be very painful.
This sentence is expressing the emotional pain one might experience due to losing a pet, utilizing 'Verlust' to refer to the loss of the pet.
We have to prepare for possible loss.
Here, 'Verlust' is used in direct relation to loss, in a context of preparing or bracing for any negative outcome which might be regarded as a loss.
The loss of the key can be problematic.
In this example, 'Verlust' is used to depict losing something, in this case, a key, which could potentially lead to difficulties or problems.