Whistle

Character Bio
Whistle is a non anthropomorphic dog and a recurring character, first appearing in Doggone It. Whistle is based on writer Ken Pontac's dog with the same name, whose barks were recorded for the episode. Whistle and his look-alikes have also made several other appearences such as in A Sight for Sore Eyes, Junk in the Trunk, and Chore Loser.

Whistle is mostly a sweet and seemingly harmless puppy, however, when he hears a whistling sound (such as a whistling tea kettle, a bird whistling, or someone blowing a whistle) he becomes savage and blood-thirsty, killing the closest person. Because of this behavior, he is often compared to Flippy. When he has finished killing someone, he turns back into a regular puppy. In Doggone It there are dozens of dogs just like Whistle in the back of Lifty and Shifty's van, who also go insane when they hear a whistle. He served as The Mole's guide dog in A Sight for Sore Eyes, though he was yellow and non-aggressive.

A dog similar to Whistle or a different version of Whistle appeared in the HTF-Break short Chore Loser, only it was blue and attacked people without hearing a whistle. The Cursed Idol was in this episode, however, making it possible that it was the cause of his aggression.

Cub's Death
The concept behind Whistle's killing method is to kill something, then he returns to his friendlier mentality, and there has been confusion if he has killed Cub in Doggone It, it is actually fair to assume Whistle hasn't killed Cub because Whistle was still acting savage even after Cub was attacked and he was all over Pop. Despite saying that, there are two points to make that go against this statement: the first is Cub could've bled out while Pop was being attacked, as he was very badly injured, the other being that Whistle is supposed to return to "normal" after killing someone, doesn't mean he will, it is common for an animal to not be 100% consistent in their behaviour, however, it can be argued to defend this point as he only ever went back to his friendly state when no-one saw him kill anything, so he may have been caught in the act by Pop, and that spurred him on to attack Pop.

Episode Count

 * Doggone It
 * A Sight for Sore Eyes
 * Junk in the Trunk
 * Chore Loser

Kill Count

 * Giggles: 1 (Doggone It)
 * The Mole: 1 (Doggone It)
 * Lumpy: 1 (Doggone It)
 * Disco Bear: 1 (Doggone It)
 * Cub: 2 (Doggone It (debatable); Chore Loser)

Trivia

 * Whistle, like Fall Out Boy, is based on a real character, (Ken Pontac's dog).
 * Every time that someone whistles, Whistle turns evil and kills someone near him.