Leftover of dog
Sayyidina Abu Huraira (RA) reported that the Prophet (SAW) said, "When a dog laps a
vessel wash it seven times, rubbing it with earth the first or the last time. If a cat puts its
mouth into a vessel wash it once."
[Ahmed9516, 9936, Bukhari 172, Muslim 279, Abu Dawud 71, 72, Nisai 83, Muslim 364]