Amazing Dogs (2019)

S1E4 Flea or Die!

CatDog end up with fleas, leading them to don a rather unfashionable belt as a remedy. Dog is adamant about not wearing it. Eventually, when he relents, the fleas migrate to Cat, igniting a squabble between the two over the belt. Once the belt loses its effectiveness, they come up with a solution to relocate the pesky fleas to a different place.