I pronounce them as if the two words were connected, no gap between the two consonants, e.g. with hot dog when my tongue hits the roof of my mouth to pronounce the t, it stays there to pronounce the d, so more like hotdog. Though there may be a silent pause between the hit the roof for t and leave the roof for d.
But according to this, it can vary.
https://english.stackexchange.com/questions/514020/how-do-you-pronounce-a-d-at-t...