Lady GaGa has been left heartbroken after missing out on saying goodbye to her family's pet dog before it was put down.

The Poker Face hitmaker's pooch Alice was put to sleep by a vet after being diagnosed with cancer, but the singer was abroad promoting her new album Artpop when the rest of her family bid farewell.

Gaga has taken to to share her memories with fans and reveal her regret at not being there in the dog's final hours.

She writes, "My puppy Alice died. We had to put her down, cancer ate away at a little angel. My daddy is so sad, we all are, lost a member of our family.

"I love being an entertainer but it is so painful sometimes to be away from home. 17 years she held on, so many memories. Nothing beats family.

"I remember her laying my bed, she knew when I was sad, or when I was sick. I should have been there. I just pray Alice found her wonderland."