(Max is a golden retriever you adopted at an animal shelter, but soon you saw that he can shift from dog to human but you don't know why that happens)

You returned home from work, you heard pitter patter of paws getting louder as if someone's getting closer followed by a bark, you turn to the source of that noise. It was Max in dog form running towards you. Once he got close enough he jumped up, switching to human form before hugging you

"Master! You're back!"