Royal Canin Large Adult Digestive Care Dry Dog Food, 30lb ReptileHLBrand_Reptizoo it will function as both

it will function as both an aerobic filter and an anaerobic denitrifying filter

and 1 Sponge Scrubber head

Sizing - Collar fits dogs 8 pounds and up and the adjustable strap fits pets with a neck size up to 23 inches

For dogs 2

Royal Canin Large Adult Digestive Care Dry Dog Food, 30lb ReptileHLBrand_Reptizoo it will function as bothLARGE Digestive Care is formulated to meet the unique nutritional needs of adult and mature large breed dogs over 15 months old, between 56 and 100 lbs, with digestive sensitivities. Complete and balanced food for adult dogs. Features & Benefits: Proven results: Up to 92% optimal stool quality. Poor quality stools can be a sign of digestive sensitivity. An easy to digest food can support optimal digestive health, which contributes to your dogs overall