Boz, our Boxer buddy we have now is a rescue and for months wouldn't even bark. He is very quiet and only cries out when we ask him if he wants to check the mail and does the "Scooby-Doo Huh" sound when I ring the doorbell.
“He could say “I want” when he wanted a treat.”
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That’s familiar - the sis’ dog would say the full sentence “I want a hamburger”. The “hamburger” part was stretched out - “hamburrrgerrrr”.
Haven’t heard a dog that could do this yet:
https://www.youtube.com/watch?v=FdghRwWfaOQ