I am so sorry
I just lost one of my aussies in Jan and the other a couple weeks ago
I swear I will never have dogs close in age again (this is the third time for me with two's close in age)...It's not easy and only a decision you can make.
ANd cool that you have a savannah!! I want one, but no where in my area can you find one..
Hang in there, hugs to your pets