It's obviously not just a clean copy of Huskycoin.
The two have different criteria. Aside from the usual different basic parameters, especially the distribution model is very different.

Huskycoin has this:

So diminishing returns for miners.
Mastiffcoin uses superblocks at the beginning and end, with a longer "normal" period in the middle.
That is a lot fairer and more incentivizing for miners, don't you think? Probably one of the reasons Husky hasn't taken off in a significant way.