Yeah, the thing is, people don't talk with spaces. We anticipate the second word and this affects how we say the first one. The proof for this is- if you record someone talking and then move the words around in Audacity or whatever- it sounds completely unnatural- like an automated train station announcement.
Also, people often slur speech in a way that sounds perfectly natural, but is rarely thought about. So, the word 'ladies' often sounds more like 'lays' if you analyse it in natural speech.
So- 'hot dog' might be prounounced 'hoddog' and so on.
I like linguistics chat on itchio- this was my degree XD