A video has been going viral among animal and music lovers — and with good reason. It shows Grammy-nominated singer-songwriter Neko Case sitting on her bed, playing her guitar and belting out a love song to her big, black wolf of a dog, Liza.

Liza is utterly blissed out during the happy serenade. The shepherd mix rolls over on her back and lets Neko strum her guitar with her paw. Then she rests her head on Neko’s knee and looks up adoringly at her. Then she relaxes in a big furry heap on the bed and sighs.

The bond between Neko and Liza is clear, and the love they share is undeniable. And, even though Liza passed away on Sept. 13 at the age of 17, it’s a love that will go on and on and on.

Liza and Neko’s story is captured in the pages of our new book, My Old Dog: Rescued Pets with Remarkable Second Acts. Neko shared the story in the foreword to the book, and it’s a tribute and a shout-out to senior shelter dogs like Liza everywhere.

“The day I met (Liza) at a shelter in Tucson, Arizona, I was struck by her gentleness and her patience,” Neko writes in My Old Dog’s foreword. “There she was, an older girl flanked by other dogs in the same crowded kennel. One dog kept barking and barking right in Liza’s ear, but Liza would not get annoyed. She just endured the racket with a Zen-like calm. I remember thinking, ‘I have to get her out of here — now! That is the most patient dog on earth!’ And I did. I brought her home with me, and then I marveled because I have never had to teach her a single thing. Liza came to me fully formed as an ideal family member and friend. No one has ever loved me more than that dog.”

Neko Case shared this photo of Liza on Sept. 14 with the caption: “Last photo of the old lady from Saturday. Worn out from bone chewing. :)” (Photo credit: @NekoCase / Twitter)

Neko — a lifelong animal lover and an ambassador for Best Friends Animal Society — makes a passionate case in My Old Dog for how wonderful it is to give a senior shelter animal a second chance and a happy home.

“The oldies often have great senses of humor and bring some unexpected comedy into the house,” Neko writes. “And they often keep on trucking much longer than you might expect. Then, when their quality of life begins to erode too much, they will tell you. You will hear them. And you will know in your bones that they are not afraid.”

That’s exactly what happened with Liza. She let Neko know it was time. Neko said Liza had a smile on her face and a raw beef bone in her paws when she went.

“She was so happy and ready. No pain, no fear,” Neko told us. “Thanks for letting me immortalize her in your gorgeous book.”

We are so sorry for your loss, Neko, and so grateful to you for your unshakeable love and support for homeless animals. Liza was such a good girl. And you are such a rock star.

Love stories and photos of sweet senior pooches? The book “My Old Dog: Rescued Pets with Remarkable Second Acts,” written by Laura T. Coffey and with photographs by Lori Fusaro, is due out on Oct. 6. It’s available now at Amazon.com and BarnesAndNoble.com.