It was easier for me than when we had Holly put to sleep because I wasn't on my own, I had DH with me for support plus because she was such a little dog we got to hold her while she was given the medication. We also got to bring her home wrapped in a blanket. We put her into her bed and then left her on our bed for a while while we all got to say goodbye and then we buried her in the chook pen next to Holly.
She definitely had "small dog syndrome" and just loved the sun or sitting in front of the fire and "toasting" - we only had her for 8.5 years but she was truly loved and a very dear part of our family.
I'm writing this with a heavy heart and a gap next to me - if she wasn't in front of the fire she sat in my chair with me......