The pronunciation of words ending in S depends on the final consonant, i.e., the final sound.
1. words ending in S
dogs, cats, horses
verbs for the third person singular
looks, knows, owns
John’s car, its
2. how to pronounce
Here is some snapshots taken from videos .
The more detailed one:
YouTube: How to pronounce words ending in S
YouTube：Pronouncing ‘S’ at the end of words in English? – English pronunciation Lesson