Steady a ladder against your house, so that the legs of the ladder are both firmly level on the ground. The base of the ladder should be 1 foot away from the house for every 4 feet in height.
Locate the plumbing vent on the top of your roof and determine the cause of the blockage. If it is winter, you may notice that the snow on the roof is covering the hole of the vent. Ice may also be covering the vent. In some cases, leaves during the fall or an animal carcass could be in the pipe and causing the toilet to growl.
Remove snow surrounding the vent and pull any ice and snow off the vent to unblock it. If there is an animal carcass in the vent, protect your hands with gloves and pull it out. If it is far down the pipe, you can use a pipe snake to pull it out or hire a plumber to remove it.
Widen the top section of the vent with a new piece that is up to 4 inches in diameter. This will prevent snow and ice from being able to clog the vent. If an animal carcass was the problem, cover the vent with a piece of hardware cloth and use a hose clamp to secure it.