回复：谢谢你啊，听上去真不错。赶快研究一下~

 

Amazon.com: PetSafe Wireless Pet Containment System, PIF-300 ... 279.95 dollar

I will not keep the dog too long with the collar, mostly about 10-15 minute, then I put him on my deck, it is safer and more economic way ...you still need to pay attention when the dog bark in the outside, when he bark I will open the door, try to see what is going on, mostly there could be kids or other dog around him, so I will call my dog make sure he is not running away. it is cheapest way to keep dog outside, but the bettery do run fast, read the  review on this product, you will have some idea....