Animal-activated animal waterers; Animal-activated pet feeders that include dispensers for releasing pet toy feeder balls with pet food and pet treats therein; Bird feeders; Cat litter boxes; Electric pet brushes; Filters for use in cat litter boxes; Indoor aquaria; Pet grooming device comprising a built in brush head and an attachment that connects to a water source; Pet grooming device comprising a built in brush head and an attachment that connects to vacuums