I think it's likely enough that we have rats running around at night. I haven't seen any squirrels so far. Since the fence has been up, the dill and some of the lettuce have grown back, so I think the fence is working, but will keep watching to make sure.
The sprinkler looks really useful. Thanks for the suggestions!
I would not recommend the Scarecrow. They are cheaply made for the price and will not last very long. Check out the Orbit 62100 Yard Enforcer Motion Activated Sprinkler instead.
Hmm, good to know.