Thousands of pit bull advocates will gather in the nation's capital next month for the inaugural One Million Pibble March on Washington.

The dogs, affectionately known as "pibbles," have long been used in dogfights and targeted in breed-specific legislation that restricts their ownership. Rally participants hope to elicit change on both of these fronts.

Rebecca Corry with pit bullComedian and bit bull advocate Rebecca Corry (pictured right) organized the march and estimates that more than 5,000 people will convene on the West Lawn of the U.S. Capitol on May 3.

However, one group will be noticeably absent: pit bulls.

Although she's been criticized for the decision, Corry has asked that no one bring their dogs to the event.

In a blog post, she stated that there are dangers in bringing many dogs of any breed together into what could potentially be a stressful situation.

"Dogs are not allowed at the march because, simply put, dogs cannot change laws. The U.S. Capitol is not a dog park and this is not an opportunity to make it one," she wrote.

Courteney Cox, Janeane Garofolo, Moby and other celebrities have lent their support to Corry's pit bull advocacy group, Stand Up For Pits, and Corry has even invited the president himself to the event.

Although Obama hasn't RSVP'd, last year, his administration came out against legislation that restricts ownership of certain breeds of dogs.

In response to a petition to ban such legislation, the Obama administration wrote, "We don't support breed specific legislation — research shows that bans on certain types of dogs are largely ineffective and often a waste of public resources."

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