Know what it is like as we've lost a few really good onse over the years. Our Molly was am Irish wolfhound x old English and 16 yrs when she passed. I still miss her a great deal. Some dogs just catch you like that. Best thing go get another to love on. We have only had 3 weeks without a dog in all our married life of nearly 30yrs. You have a loving home and plenty to give. Some where out there is a Dog just aching for someone like you!!!!!!!
My 14 year old pointer/lab mix, Kes, is still pretty spry when she gets to run out in the woods on the property, but I know it's only a matter of time. I hope she goes in her sleep like your Kismet.