Former A&E personality Tony McCollister — who is charged with raping a child and having sex with two dogs — says he’s not guilty by reason of insanity … and he wants to get his head checked.

McCollister is facing 26 felony charges related to sex with a minor under the age of 10, plus 4 misdemeanor counts of sexual conduct with an animal … and on Thursday, he entered his plea and filed a motion asking the court to order an evaluation of his mental state at the time of the alleged crimes.

In Ohio — where McCollister is charged — a defendant must prove they did not know right from wrong at the time of the crime to be considered not guilty by reason of insanity.

As we told you … a judge already ordered McCollister to stay the hell away from kids and dogs … and, specifically, not to have sex with animals.