着重处理宠物经常在庭院里停留的阴凉处。 清除庭院里散乱的垃圾，包括散落的树枝和枯叶、碎草屑，还有到处乱放的工具或设备。 在庭院喷杀虫剂，杀死藏在里面的跳蚤。 如果你需要帮助，可以联络专业的除虫公司。 在庭院撒雪松碎屑，防止跳蚤到回来。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Fleas thrive in dark, moist environments, and you’ll most likely find them in places where your dog likes to run around, hang out, or rest. It’s not necessary to treat your whole yard for fleas, especially parts of your yard that get a lot of sun. Fleas don’t do well in dry, sunny areas. If you want to test your yard for fleas, try walking through it with white socks on. If you see any fleas on your socks, it's likely that parts of your yard are infested. This includes fallen branches or leaves,