Yes, I have been attacked by a squirrel.
No, I haven't been attacked by a squirrel.
I shot all the squirrels in my yard because i have been attacked. It was only self defense.
We were both drunk and I antagonized him, I wasn't attacked. I said some hurtful things about its mother, it was its duty to respond.
I'm not sure I've even seen a squirrel. The most common attacking animals in our part of the world (stray dogs excluded) are monkeys.
We don't have squirrels.