Remorse, coarse, force, gorse, course, source, of course, enforce, intercourse.
amoeba (not really animal, its a protist)
Giraffe??
seahorse
Ape
Boars is a good match. Horse could rhyme with bores, depending on how you pronounce it.
The adult male deer, particularly a red deer, is called a stag. An "old, tired" horse is called a nag.
No animal name rhymes with "trouble".
Mare
animal name that has the same vowel sound of apple.
Gazelle
hornbill
Cobra
Luture
cow, sow
Stimpy
Brim