Absolutely. The inclusion of cats in spells and pharmacy is a showcase of the attitude towards animals back then. Cat brain is mentioned in the picatrix, in the magus , in the 3 books of agrippa and in the Grimorum verum.cyberdemon wrote:Back in the day when such grimoires were written, these things were far easier to do mainly because of the lack of all these laws, even if one did these in secret.
It's not mentioned in the 'long lost friend' but coffin nails are, so necromancy (using human body parts) was not unheard of in the 19th century.
Wolfs were everywhere and in some countries the king would actually pay the citizens to kill them. Dogs were not worth much more.
And of course we have to remember that this is christian magic/jewish magic and the sacrificial use of animals are in both the old and the new testaments. Goats and rams being used almost at every holiday and doves are still sacrificed in some Jewish sects and communities.
Today we frown upon eating pets, but back in the middle ages it was quite common here in Europe. We did almost starve to death a couple of times so the inclusions of beloved animals in historical cooking recipes are not unheard of. Especially in England/France there are some amazingly bizarre recipes for almost everything that moved.
And things like animal rights would have been thought of as completely silly. The fact that some people today have a hard time watching a hen being killed would not resonate in that society. Santeria practitioners use roosters in summoning spells all the time and it hasn't been a problem up until modern times. in fact the exclusion of blood/gore from ceremonial magic is a pretty modern invention.
In the 'Sixth and Seventh Books of Moses' there is also some ritual killing of doves, But I guess if you are willing to summon demons, a bit of animal cruelty is pretty low on your list of sins.
Although it should probably be mentioned that the Picatrix is supposedly written by the Moors; dogs are actually haram in islam, and not eaten or commonly kept as pets. Cats are not haram but some scholars points to a haddit saying that the commercial selling of cats and dogs are forbidden. So it is perplexing to find it so casually discussed.