Food aggression in dogs is normal. You have to train them to not be, and no stranger should try to take. Heck you shouldn't unless it is something dangerous. Do you have any idea where the guy got the dog from? Perhaps its breeder might help you with training. Do you know if perhaps the exgirlfriend wanted the dog and he took it for spite?
OMG! Just realized…
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My first B, Shaka came to us 15 years ago today (Ides of March) and left us on 3/21/08 (on Good Friday) - this made me realize that his littermate brother (who we got 3 months after) , Yoda is actually 15 years old (and not 14 as I had thought)! He's still pretty energetic and looks young, but now I'm more concerned. Extra treats for him!
Chance
Shaka & Yoda's daddyPics of Shaka and Yoda on Facebook:
http://tinyurl.com/86o9zpo -
Just keep doing what you have been doing… a 15 year old basenji is a testament to the care their owner is giving them. But yes, extra treats and kisses are a must!