1: Can it be used during rain?
There is no final answer to this question. So you can use some Wireless during the rain while other Wireless Fence cannot. It depends upon the features of the Wireless Fence. Suppose the receiver collar is waterproof so you can use it during the rain. Mostly PetSafe Wireless Fence collar is waterproof; even you can use it during the rain-snow and short submersion in water.