I'm so sorry. Perhaps his spirit did not give up, only his poor body couldn't go on.
I still have a box full of treasured reminders of my first "dog of my very own"--the beloved dachshund Claire, who was with me for 17 great years. For days after her death, I kept everything just as it had been for so many years--bed, food dishes, toys all in place. I couldn't bear to take them up (as if somehow that made her loss final?). Then there came a day when I couldn't bear to see her things anymore--reminders of the horrid loss. I boxed up the things I didn't want to part with. Trust your own timing--your emotions/heart/mind will tell you when it is time for each step in grief and healing.
It is important to let yourself grieve as much and as long as you need to-- that is an important step in healthy healing. I cried off and on for months after Claire's death. I still tear up thinking of her loss after 10 years, but mostly I have all the happy memories of her and you will have all the happy, loving memories of Salvador to keep him as a loving and beloved presence in your life.
Lucy