I know so many lol. I used to read a lot of animal books as a kid. Most of these are 30+ years old
White Fang by Jack London
Julie of the Wolves by Jean Craighead George
Julie's Wolf Pack by Jean Craighead George
Plague Dogs by Richard Adams
Wings of Fire by Tui T. Sutherland
Mrs. Frisby and the Rats of NIMH by Robert C. O'Brien
Stone Fox by John Reynolds Gardiner
War Horse by Michael Morpurgo
Fantastic Mr Fox by Roald Dahl
Charlotte’s Web by E.B. White
Some picture books that I had to include becuz nostalgia:
Angelina Ballerina by Katharine Holabird
Cat Wings by Ursula K. Le Guin
Chrysanthemum by Kevin Henkes
Every book by Richard Scarry (Busy, Busy Town, What Do People Do All Day?, Best Word Book Ever, Cars and Trucks and Things That Go)
Some of these (Stone Fox, White Fang, Julie of the Wolves, and War Horse) are told at least partially in the perspective of human characters but I still recommend reading them.