Oh. That’s terrible. Sorry to hear that. I don’t know what the sacrifice was for or if the sacrifice had any connection to the dog. However if it did, it doesn’t necessarily have to be a bad thing. In fact, many times when something negative (i.e. spiritual attacks) is sent for someone, your animal can take it in place of you. Again, I don’t know what the sacrifice was for but it could have assisted you in this way as well.
But that is just one theory. You should contact the spiritualist who performed the sacrifice and divination. They may be in a better position to answer.