It’s not true, it was reintroduced as a bill with a modified name:.
https://blog.hslf.org/political_anim…se-soring.html
H.R. 693 will amend the Horse Protection Act to eliminate the failed walking horse industry system of self-policing (i.e., the fox guarding the henhouse), and put the U.S. Department of Agriculture in charge of licensing, training, and oversight of all inspectors, as recommended by the Inspector General’s 2010 audit. It will also ban the use at horse shows of devices that are integral to the soring process, strengthen penalties for violations, and hold abusers accountable. And according to the non-partisan Congressional Budget Office, the legislation will accomplish all of these needed reforms without any additional taxpayer burden.