Near the end of Terra’s life, we did the same. It helped her.
Nasal cancer had started to come back.
13+ years for a fantastic GSD.
We still miss her and the one before named Major.
Mine was Woody. Made it to nearly 15 with a massive untreatable rumor on his left hip, that popped up right at the site of his last vaccination. I kept him comfortable and happy as a clam with palliative pain treatments. He passed away in his sleep beside my bed.