Dog hair can potentially clog the filters and skimmers in a pool, which can lead to reduced circulation and filtration of the water. This can lead to water quality issues and make it more difficult to maintain the pool. It is generally a good idea to remove any dog hair from the pool before it has a chance to clog the filters. This can be done by using a pool brush or vacuum to sweep the hair off the surface of the water and out of the pool. It is also a good idea to rinse off your dog before allowing it to enter the pool, as this can help to minimize the amount of hair that ends up in the water.