I lost my 19 year old daughter in March 2008 and my Sheltie pup of 12 years, Timber, just 7 weeks later.
That was the hardest time of my life, losing them both so close together.
I too, had to wait until I could bring home Bacca. It took me only about a week to decide to get another Sheltie, even though, initially, I could not even think about "replacing" Timber.
But once I decided, I filled my time planning for the new puppy. I really helped to fill the holes in my life. A month later, Bacca came home.
I know its a terribly hard period, and you can never replace your darling entirely. But thankfully, our hearts are big enough to accept others in, while still holding our departed close, never to be forgotten.
Hugs to you!