Pluto is found and raised by Chowder and doesn’t meet the turtles until older. Due to being part Krang Pluto actually grows faster than the average, so when Pluto and the turtles meet, Pluto is almost fully grown.
I’m still working on chowders backstory, but I’m aiming towards a bounty hunter tsukumogami yokai. They try their best to raise Pluto but find themselves off and on jobs that are sometimes dangerous, so secrecy is an important necessity. Chowder is loud, sassy and very affectionate, however they are very temperamental and will hold a grudge if annoyed. Chowder loves Pluto and decided to give Pluto the nickname monkey due to Pluto’s love for bananas and need to climb on them 24/7, that plus they just think it’s a funny name.
So yeah Chowder :D