Flarestar, DNA similarity doesn't equate to pharmacological and metabolic similarity.
For instance, the theobromine in chocolate is cardiotoxic to dogs and eating even small quantities of chocolate can kill a dog, similarly the sugar alcohol xylitol often used as a sweetener, in canines, causes a massive release of insulin which can prove fatal.
And we share a good deal of our genes with a banana, a tapeworm, and probably even a few percent with george bush too, doesn't mean any of them are close to human.