Technically no, your dog should not be drinking pool water simply because of the chemicals used to keep the pool water clean and safe for people to swim in. Will your dog get sick from drinking a small amount of the pool water (say some gets in his mouth while swimming)? Probably not. However, you should talk with your vet to find out for sure. If your dog is swimming in the pool a lot then you should try and monitor to make sure he’s not swallowing a lot of the water. If your dog hangs out by the pool during the day make sure he has plenty of fresh bowls of water to drink so he doesn’t feel a need to drink out of the pool. If this doesn’t work and you notice your dog is starting to develop a habit of getting a sip of pool water then you should contact your vet Pleasanton, CA regarding your dog’s health and then no longer allow your dog around the pool.