The police have a history of shooting non-aggressive dogs (many examples can be found
here), so racial implications aside, that's a bad analogy for the point you're trying to make.
I think there is a valid point of comparison you could make between black people and dogs in how they're viewed as an immediate danger by the police regardless of the actual threat posed. Many officers are clearly willing to shoot them as a first resort, use the same "feared for my life" excuse to justify their shootings, and largely get off scot-free afterwards, with cities taking on lawsuits instead of enacting reform.
That any segment of our human population is treated so closely to animals (especially when those animals are also treated unjustly) should be a big indicator that our criminal justice system has serious deep-seated problems that need to be addressed fucking yesterday. You should be worried, or angry, or anything other than willing to make excuses for people who have yet to prove that they deserve the benefit of the doubt in cases like this.