Cats and dogs can share a water bowl, but this is not recommended because cats and dogs may have different bacteria and viruses in their mouths. If one animal has an oral disease, the other animal may become infected when sharing the water bowl.
Additionally, some cats and dogs may experience stress from each other's scent or presence, which could cause them to refuse to drink from the same bowl. Furthermore, sharing a bowl can lead to competition between cats and dogs, especially when one animal has an advantage over the other.
