I looked at the label and no where did I find bht in the product. Maybe you can look again?

Chemical preservatives include butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), propyl gallate, propylene glycol (also used as a less-toxic version of automotive antifreeze), and ethoxyquin. BHA, BHT, and ethoxyquin are potentially cancer-causing agents.

Meat by-products: Pet grade meat by-products consist of organs and parts either not desired, or condemned, for human consumption. This can include bones, blood, intestines, lungs, ligaments, heads, feet, and feathers.

Ethoxyquin
Promoted kidney carcinogenesis.
Significantly increased incidence of stomach tumors.
Enhanced bladder carcinogenesis.

BHA
Enhanced stomach and urinary bladder carcinogenesis.
Causes squamous-cell carcinomas in stomachs.
(Cancers of this type are among the most lethal and fastest acting, the swiftest effects being seen among animals with light colored fur.)

BHT
Promoted urinary bladder carcinogenesis.
Could be a promoter of thyroid carcinogenesis.
Studies have noted that BHA and other antioxidants, particularly Propyl Gallate and ethoxyquin, showed additional effects in inducing stomach hyperplasia and cytotoxicity.

According to Dr. Wendell Belfield, DVM, practicing veterinarian for some 26 years, both BHA and BHT are known to cause liver and kidney dysfunction and are banned in some European countries. He adds that ethoxyquin is suspected of causing cancer and that propylene glycol (a pet food ingredient closely related to anti-freeze) causes destruction of red blood cells.