The royal family on Saturday conveyed warm birthday greetings to Freddy, a Trainee Medical Alert Assistance Dog named after the late Queen Elizabeth.
The birthday greeting appeared in the comments area of the charity's Instagram post.
The caption on the dog's photo released by the charity read: "Happy Birthday to Freddy!"
"Freddy, a trainee Medical Alert Assistance Dog, had his first birthday this week and was appropriately treated with presents from his puppy socialiser. They contained a tuggy toy and other goodies, but his favourite was the cuddly avocado!"