On average, each squirt is about two ounces so it would take about 32 to get a gallon. Oops, make that 128 ozs per US Gallon, so if 2 ozs per squirt, that would be 64 squirts. So get comfortable, and work those arms.
If a cane toad squirts poison into a dog's eye, it's a medical emergency. The poison could be absorbed through the eye and possibly result in death. Wash the dog's eyes with water and take it to the vet for treatment.
This question does not have an answer because when you are ten you are in squirts and in the rules of USA hockey you have to be a Peewee to hit and take slap shots and I don't think anyone has tested this.