If you liked the "Wild at Heart" series...

 There are twelve books in the "Wild at
Heart" series by Laurie Halse Anderson and Central Rappahannock Regional
Library has eleven of them for you to check out. If you haven't already
read more in that series, you might enjoy trying one of the others.
Other books I would recommend for animal lovers and high level readers

A Tarantula in My Purse by Jean Craighead George.

A collection of autobiographical stories about raising a houseful of
children and wild pets including crows, skunks, and raccoons.

My Side of the Mountain by Jean Craighead George.

A young boy relates his adventures during the year he spends living
alone in the Catskill Mountains including his struggle for survival, his
dependence on nature, his animal friends, and his ultimate realization
that he needs human companionship.

The Fire Pony by Rodman Philbrick.

Eleven-year-old Roy lets himself find a loving family and a new home on
the horse ranch which he and his older half-brother happen to come upon.

Room with a Zoo by Jules Feiffer.

Nine-year-old Julie loves animals. So much it seems that she's
assembling a zoo in her room. But, what she really wants is a dog.

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.