i think they do its just more of in pitch like when we say some like GREAT! you can say it sarcasticly and you can say it in a depressed way and an excited way etc so i think thats how animals understand for example:

if you call you dog loudly HERE BOY! GOOD DOG C'MERE!!!! He'll come bounding to you but if your talking loudly in an angry manner NO!! BAD DOG!!! he'll slink awawy.


im sowwy if that made no sense but im too stoned to think it matters.