Wait ... did we just possibly add a slime AND a snake to the cast/party. Well, here's hoping that they can both transform (into girls ahem) and travel with the party. UNLESS, the snake is about to become boots and snake steaks. Then it was nice to meet you.
Yes, he is speaking dog/fenir/wolf and I now wonder if this is how it seems to everyone else but the MC. That would be funny if when he is having a conversation with them and the only thing other people hear is him making a bunch of weird sounds and grunts.