Based on psychological theories of mindfulness and Acceptance and Commitment Therapy, as well as concepts from Cognitive Behavioural therapy and psycho-education, Mr Wiggles takes children on a journey as he goes through the loss of a pet and all the emotions associated with it. Pets are often a big part of a child's life and losing them stirs up many questions and emotions for a child. This book is aimed to help children name and express emotions and can help teach them about the cycle of life and death. It is also a tool for parents and professionals to assist children to be mindful of their sadness, to notice but not stay in it. It teaches children to find healthy ways to express emotions about any loss in their lives and develop coping skills for managing grief.