there was a pack of dogs that attacked me when they were invisible

the dogs where invisible and i heard a hurt noise but they didnt die so i ran and met up with my friends he thought was mad but he got killed by them and i then ran like mad and they chased me but i ran over ice and fell down into a dungeon that the dogs fell down into as well so i died lost all my dimond gear and when i died on the server it said i was killed by a wolf the server was apex and ip is 98.200.204.143 and i call this bug ghost dogs