What is a cross between greyhound and terrier called?

There isn't a specific recognized breed name for a cross between a Greyhound and a Terrier. This type of mix is often referred to as a Greyhound Terrier mix or simply a Greyhound Terrier.

Some breeders and owners might use more descriptive names, like "Greyhound-Jack Russell mix" or "Greyhound-Yorkshire Terrier mix" to indicate the specific terrier breed involved.

Remember, these mixes are not purebreds, so there's a lot of variation in their appearance and temperament depending on the specific parents.