If you like Gooseberry Park...
Thank you for your Book Match Request. I have not read Gooseberry Park myself, but I can recommend some fantasy and dog titles you might enjoy.
Because of Winn-Dixie by Kate DiCamillo
Ten-year-old India Opal Buloni describes her first summer in the town of Naomi, Florida, and all the good things that happen to her because of her big ugly dog Winn-Dixie.
Chuck and Danielle by Peter Dickinson
Danielle's pet whippet, Chuck, is terrified of absolutely everything, but Danielle is sure that Chuck is going to save the universe one day.
Dolphin Luck by Hilary McKay
Sent by their vacationing parents to visit Mad Aunt Mabel, Perry and Ant have an adventure, while their younger siblings Sun Dance and Beany stay at home making burglar traps and searching for a magic sword.
The Girl Who Owned a City by O.T. Nolan.
When a plague sweeps over the earth killing everyone except children under twelve, ten-year-old Lisa organizes a group to rebuild a new way of life.
Half Magic by Edward Eager. A magical coin grants the children half of whatever they wish for, with unexpected consequences.