TW: Family pet death

My sweetest baby boy Banjo died unexpectedly on Wednesday. I am just heartbroken. He was 6 and a half years old Great Dane and had a manageable form of heart disease. It got worse so suddenly. We made the impossible decision to let him cross the rainbow bridge and ease him of his discomfort versus trying to prolong his life for our own sake. I'm still in shock. He was my best friend.

I'm watching two dogs right now. One of them is a regular that I've had many times, and the other is first time boarding situation. I told the former already in a message because I thought it was appropriate, but I actually feel a bit guilty to put the burden of my sadness on them. They're coming to pick up their dog in 4 days so I am going to power through. The other is a 6 week long boarding situation and I haven't told her yet. Part of me wants to send a message because I just frankly am unsure if I can keep watching these dogs with this heartache and want to prepare that possibility in her mind. Additionally, I am the kind of person who can't live with the quiet and am thinking about adopting a new one in the next month or so. This could mean potentially that this person dropped off their dog with one Great Dane only to find another one here. I have never lost a dog before so unsure what to do.

Has anyone been in this situation? I don't want to rehash the pain when these people come pick up their dogs if I end up maintaining the boarding.