From my experience, dogs are rather bad at distinguishing words. They spend attention on the context, intonation, body language and number of syllables. If you say anything similar with the intonation of calling your dog, he will probably walk towards you. Of course there are exceptions. Some fogs are better in that than others. However, the average dog doesn't really care.

From my experience, dogs are rather bad at distinguishing words. They spend attention to the context, intonation, body language and number of syllables. If you say anything similar with the intonation of calling your dog, they will probably walk towards you. 

Of course there are exceptions. Some dogs are better in that regard than others. However, the average dog doesn't really care.