The constitution doesn't guarantee you rights.
The Bill of Rights enumerates but does not limit the inalienable rights
with which our Creator has endowed us
and forbids the government infringing upon them.
Among these rights are Life, Liberty and the Pursuit of Happiness.
I adhere to the conservative principle elucidated in #3 of...
A nation of Free men is a nation of Responsible men.
A government propagating that men can not be trusted to be responsible
seeks to destroy freedom and is a traveling the road to tyranny.
The bill of rights is part of the constitution; therefore, the constitution does guarantee rights and among those rights is the right of the states to police themselves in matters not specifically mentioned in the constitution i.e. public health, welfare, and safety. That means a state government is perfectly within its rights to regulate the existence of pitbulls and fighting dogs within their borders. As this is a constitutional republic we live in, the rule of law (as described in number 4) is upheld.