I have been reading all the responces to this topic, and I just had to comment. I am birdaholics DW, the wife in question. The place I work is a VEERRYYY small dental lab. No personel officer, no union stewerd, just a boss and about thirteen of us technicians. The fellow that has been annoying me is an extreeme conservative, rightiously religious, and feels the need to share his beliefs and ideas with everyone, including me.
I would never consider violence, or even anger, this is an intimate workplace, we all HAVE to get along. So far when he has said this about animals having no soul, it has been "tacked on" to the end of some other conversation about animals in general.
I would like to know how to tell him, in an intelligent manner, that I don't agree, without stooping to his level and sounding patronizing. I don't want to open a religious discussion with him, as many of you have commented, it is pointless, but I would like to be able to tell him I hear him, but don't agree. Thank you all for your interest and comments! I will be reading over my DH's shoulder, thanks guys.