1:38 PM PT -- TMZ Sports has learned Zelda is doing just fine after the incident, being taken care of by trained professionals at the SPCA of Texas.
A spokesperson for the organization tells us Zelda has received full care -- including "a ton of TLC" -- since she's been in their custody ... and is expected to be put up for adoption within the next few days.
Ex-UFC star Frank Shamrock is reportedly being investigated by cops after he tied a dog to a truck and abandoned it for 5 DAYS at a Dallas airport earlier this month.