Thanks everyone for your responses and kind words
I have always seen the Shiba inu in him, but thought perhaps I was imagining it. Even had a theory maybe he was a Finnish Spitz cross, but they're not common here.
And bear in mind I live in Australia, where Shibas and Basenjis are quite rare. I was at the dog park and a lady who owned Basenjis, (and her daughter owned them too) , came up to me and asked me point blank if Charlie was cross basenji. She said it was his body and especially his legs and chest when he walks and runs. Haha, so she sees basenji?
Either way, he's my beautiful baby. Haha it's always intrigued me what his breed was, with him being a rescue.
Some extra pics
https://i.imgur.com/bMJ0D62_d.jpg?maxwidth=640&shape=thumb&fidelity=medium
https://i.imgur.com/JNXNxWl.jpg
https://i.imgur.com/yVsrqHZ.jpg