Good news!!!! hard news..... Yes that back surgery is SO SO painful, and it will subside. They had to get in there and move muscle, bone and such, and THAT is what makes it spasm, hurt, and feel like you are pulling yourself apart. It will improve. I promise. Time..... give it time..... get up as you can and walk. I did, and did, and did, became so familiar with my floor those days after fusions. Similar pain, but yours was so invasive. I feel so for you, and pray for you and your little family. 'twill be interesting to learn what you name your puppy. I bet Rae has a name in her left pocket.
Praying for you all,
Mark56

gently across the miles