Rewatching Part One Naruto, my sister pointed out that Kakashi can summon multiple animals as opposed to just the one that everyone else can. I get that, like the Sanin, who’s summoning animals are ginormous, Kakashi’s are small. (Except for Bull)
Remember back when Jiraiya was teaching Naruto how to summon toads? He kept making little tadpoles appear because he wasn’t able to mold enough chakra.
With the help of Kurama’s massive chakra reservoir he was able to summon Gamabunta. Naruto can, however, summon multiple toads at once like when he summoned both Gamakichi and Gamatatsu so we know that you can summon multiple animals just divided.
So where I’m trying to go with this is, if Kakashi focused all that chakra he uses to summon eight ninken into one, would a giant dog appear as well?