* [[spoiler: The Tod's]] HeroicSacrifice.
* Snitter blaming himself for the death of his master.
* The entire [[TearJerker/WesternAnimation animated film]].
* The poor rat in the skinner box.
* Oh, boy, you like monkeys? Well, we get treated to seeing a very cute baby monkey steadily losing it's sanity inside an isolation chamber. The dogs also startle a trio of rather unfortunate monkeys who are undergoing some sort of cranial research, who vainly try to free themselves from their restraint chairs.
[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/lab_monkeys.jpg]]
[[caption-width-right:350:Everything's sadder with monkeys]]