Dogs don’t turn their noses up at offal – kidneys, liver, head meat, tripe, sweetbreads, ears, and trotters. Testicles meat too. 
So why should we ? Those bumpy, funky bits are just as healthy and delicious as as any other part of the animal.
Known as sweetbreads on a human menu! 
These are frozen and not as yukky as you would think. 
Low fat, low smelling meat the tough outer membrane hasn’t been removed, you will have to slit it through and remove the meat inside and serve to your dog like that or cooked.