I have only seen this dog maxed at lvl 100 with high base att, and nobody seem to have opinions on it.
I took the plunge and evolved it to 5* and gave it some talismans.
While only lvl 77 now it hits around 5.5k on 5* lvl 80 warriors on perfect attacks.
With its power skill it is around 9-10k so it is pretty solid as a single target hitter. I have not spent any skill shards on it tho.