ACTUALLY...
There have been SOME reported Chihuahua attack deaths...
Here is a guy who was "mauled" by Chihuahuas (and some other dogs)...he survived the attack but later committed suicide after some intense shaming from the general public and his friends and family.
http://www.pocho.com/man-mauled-by-c...t-humiliation/
Also, I found some video on news reports of roaming packs of feral Chihuahuas in Arizona back in 2014...
http://www.huffingtonpost.com/2014/0...n_4848543.html
Scary stuff...it doesn't look like any injuries or deaths from them though. Lucky.
When you do search Chihuahua attack, you do come up with a ton of reports of Chihuahua being killed by other dogs...not so much with when you search Pit Bull attack.