D.H.
E. ~
You've had alot of great advice already. This is a tough issue, and one that apparently many of us have been through. Our house is full of rescures (2 dogs, 3 cats). A few years ago we had only 1 dog, who was getting older (he was 10). Taz was also a dog that everyone loved. So we adopted Cassie. 10 months later, we suddenly lost Taz. Already having Cassie really helped with the grief, because she was also grieving. We waited another year before we got a second dog so that Cassie could have a playmate. No one will ever replace Taz, but we have alot of love to share. Last year we lost 2 cats within 2 months, one was expected and the other suddenly. We did get 2 more kittens (at different times last year), but the requesite when looking for them was that they couldn't be the same color as the ones we lost. We didn't want to replace them, but we wanted to share our lives some more.
You have to do what's right for everyone in your family. It is easier to house train during the summer, especially if the kids are home to help during the day. You may want to get a different type of dog, so that it won't physically look like your lost Allie. No one can replace her. I still have the collar from every dog I've lost, just to keep something of them. And I will still cry when I come across them.
You can check out your local shelters on petfinder.com You can look for a breed, or click on a link of shelters near your home.
Good luck finding your new family member, when you do decide to do it!
D.