Sparky - Clydebank, Dunbartonshire
Hazel Parkyn has type 1 diabetes and a drop in blood sugar as she sleeps can have life-threatening consequences. Fortunately, pet cat Walter is always there to save the day.
Sensing when her blood sugar is running dangerously low, Walter will persistently pat her face until she wakes, giving Hazel the vital warning she needs to take action.
Herman - Buxton, Derbyshire
Within 24 hours, Claire Yates' whole world had been turned upside down when her parents died unexpectedly, just a day apart.
As Claire, who has Asperger syndrome, struggled to come to terms with the news, she found a tower of strength in Herman. Both entertaining and comforting, Herman gave Claire a reason to smile and brought a sense of calm.
Rosie - London
Deborah Elm was left devastated when husband Adam, who had cystic fibrosis, suffered a fatal stroke following a lung transplant. Hoping a pet may help, she adopted Rosie and slowly began to rebuild her life.
Over the next year, Rosie helped Deborah cope as she adjusted to her new life, cuddling up close at night and ensuring she never feels alone.