Can absorb liquid well No leakageHelps prevent bacteriaCan absorb bad odors to a certain extentYou should place the pee pad on the floor/plastic pee tray (with the tissue side up and the plastic side down) in a location easily accessible to the dog, away from food and their bed.When a dog urinates on a pee pad Pee pads should be changed every 1-2 days for cleanliness and hygiene.For dog training, use pee pads in the early stages. You should bring your dog to the pee pad several times so that they become familiar with the smell of the pee pads.SizeTrial size S 33*45, 20 sheetsSizeS 33*45 has 100 sheets.M 45*60 has 50 sheetsL 60x60 has 40 sheets.XL60*90 has 20 sheets.