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It could be due to an internal injury from trauma.   Is it possible he/she has been hit by a car or that someone could have kicked him/her.  Has the dog had a chance to roam where some kind of accident or attack could have happened?   It is also possible he/she has a urinary tract … Read more
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According to this site www.vetinfo.com, onions and to a lesser extent garlic can be toxic to dogs.  They can cause a form of hemolytic anemia (destruction of red blood cells) for reasons that are not well understood currently.  But you would probably have to give a dog a large amount of garlic for it … Read more