The gnome Busterius (named for my own dog, Buster) didn't intend to be an adventurer/hero kind of guy. He simply had a way with animals, dogs in particular, and kept busy in his community as a vet and trainer. When the other heroes passed through town with the duke's men in close pursuit only a day behind, Busterius agreed to join them mainly to keep the horses fit for a long, difficult journey. Since then, he's become an invaluable member of the party -- even though he doubts his abilities in combat or other "heroic" deeds, his friends count on him to keep their animals healthy and help them deal with certain encounters in the wilds. Busterius's own trained pets and riding dogs have been handy on the trip as well.
He's got 5 cleric levels with the Animal domain allowing companions, and another 7 level of ranger. The Animal Handling skill is a big focus for the character, and he tends to prefer mundane pets to more powerful or exotic critters.
In this case, the character is all about taking care of his animals first -- animals we have an easy time imagining, like sturdy mastiffs or nimble terrier mutts -- instead of using them as magical window-dressing or a supplement to his other abilities. So I hope this note kinda fits your question a little.