Here is some information I got about the Burdizzo being used on Adult Males and Dogs.

Discussion

The Burdizzo clamp to crush the spermatic cord has

been used in veterinary medicine to castrate primarily

lambs and goat kids with minimal post-operative

complications (Molony et al. 1993). It has also occasionally

been used to successfully vasectomise humans

by crushing the vas deferens with minimal side effects

(Zufall 1958). A case of supervised medical neutering in

humans has been reported using a Burdizzo clamp and

its use has been recommended in cases of advanced

human prostatic cancer (Herzog and Santucci 2002). In

humans, instead of performing open vasectomy, a

method using the Burdizzo to crush the vas while

preserving the plexus has been tested (Zufall 1958). This

less invasive procedure may also be useful in dogs,

although it would not reduce testosterone levels and

thus male aggressive and sexual behaviour (Pineda

1986).

The largest problem in using burdizzo clamps on humans is the differences in the physical anatomy of the spermatic cords connecting the testes to the body's blood system. In cattle and sheep, this cord is more rigid and easily crushed. In humans, it is infinitely flexible, incredibly slippery, and highly resistant to damage.