Oh how awful for you hun Cruz is beautiful.

I'm definately no expert, but I think it would probably be good for Tobi to see Cruz one he has passed. It will be distressing (for Tobi and you), but at least he will understand what's happened. Totally different situation, but when my mum passed we took her dog to see her so that he could see and understand why she had gone. I really do believe it made it easier on him.

In regard to burying him in the garden, I think that's a lovely idea. But there could be possibility that Tobi might dig him back up... You will probably have a better idea of if that is likely or not. If you are worried about it, most vets are happy to come to your home to do it and then take them away for you.