“It is not Aliens in the Attic” The aliens in the movie I am thinking of are an inch high annd land a UFO the size of a small plate on a small table or workbench. The aliens in “Attic” are about a foot tall.
Sounds a lot like the G’Gugvuntts and Vl’hurgs in the Hitchhikers Guide to the Galaxy, who attacked the Earth, only to have the entire invasion fleet swallowed by a dog.