Because cats’ bodies were not meant to process fruits such as blackberries, you should probably avoid giving them to your pet.

Although they will probably not cause any major health problems, cat owners should still avoid giving their pets blackberries, as you simply will not know how they will react to it.

Grapes and raisins are definitely not good for cats and they are in fact considered to be poisonous.

While blackberries may not be poisonous per se, they are not part of a cat’s natural diet and therefore should not be given to them at all, because you do not know how their body will react to it.