The professional feel of #15 is great! We think there is too much black though. Could you do a version of #15, with the brown dogs from #18? Also perhaps, try adjusting the color of the font. The font colors in #14 and especially #16 are fun and interesting. Both are too hard to read though.
Dear CH, thank you for the ranking and your comment during the judging phase of competition only the first ranked designer can submit new entries per your request. This means that if you would like to see any changes on any entries submitted so far, you would have to place that designer at 1st position (this can be only temporary, until he/she submits version with the changes you specified). Thanks, best regards,