Do you think that I should lie and say that a dog had been killed?
Can you tell me why you're planning on lying about a dog?
It is quite complex, I'm doing this from a humanistic point of view.
Even if your reasons are complex, lying about a pet is wrong. It will hurt people to think that it has been killed. If they find out the truth, it will damage your relationship.
It's okay, since I've been lying to them with this, some don't feel that sad or want me to get a new dog.
This makes no sense and you need to stop, if anyone ever finds out that you're lying then they might stop trusting you forever. Is that what you want to happen?