" (UTC)
Of these 4 images, apparently the first two are Renascence bulldogs, the third (Duke) an IOEBA-ish one, and the 4th I don't know. (learning)   
Leavitt Bulldogs 
  
These are the Leavittish style ones? (Above?) Looks more slender-ish.   
Yes, more slender-ish than UKC and than IOEBA.   13:29, 10 January 2014"