The Ultimate Dog Lovers Adult Colouring Book. A Perfect Colouring Book Gift for Mum, Dad, Men, Women: Ideal Dog Lover Gift. Experience the Fun of Adult Colouring with these beautiful Dog Illustration Colouring Pages. Relax and de-stress with this inspiring and calming collection of beautifully drawn dogs. These artistic illustrations of dogs will be fun to colour, taking you into a magical state of relaxation and mindfulness.