Having lost a few dogs recently (unfortunate result of having so many oldies) I'm interested in the effects on the 'pack'.
I lost Arden at the end of December. She was 10+ and had congestive heart failure for over 10 months. She was the pack alpha bitch. The house was very quiet for about a week, but generally continued as normal. It took maybe 10 days for Gwynedd (my 4 year old) to assume the mantle of alpha. Interestingly it was not Arden's 6 year old daughter Charley who stepped up -- with Gwynnie stepping up it showed the true pack status of the breeding female as alpha (Gwynnie is mum of the "I" litter. Charley's never been bred).
In April I lost my darling Findlay. The impact on the pack was much larger -- Fin was 13.5 after all. While Fin had not been the 'administrative' head of the pack for a while (that's 8-year-old Andrew) he was top dog without a doubt and his word was law (definitely ruled with a velvet glove). We are all still recovering from losing him. No-one has really stepped in to replace him, not even Andrew who has been aching for the job for years. The pack isn't rudderless and is functioning well, but there's a void. I'm interested to see how long this persists.
And now we are preparing to lose dear Biff. He's nearly 11 and has some sort of aggressive fungal or bacterial infection in his rear leg (two sites, either side of his stifle). Fortunately it is not Osteosarcoma (a real problem in his particular pedigree) We are not pursuing any kind of aggressive treatment, just good pain management (Tramadol) and anti-inflamatory (Rimadyl) and will let him go when the time is right (at which point we will biopsy for diagnosis). Biff will be the 4th dog gone from the pack in 12 months.
Anyone have observations?
And Bonnie, I'm so sorry for your loss.

Lyn