The phrase "tiny cages" refers to very small enclosures or spaces, usually used to confine or restrict movement for animals or sometimes even humans. Full definition
Puppy mill dogs are kept in tiny cages where they're forced to live in their own feces and urine. (dogtrainingnation.com)
Too often, animal advocates say, unwanted puppies at pet shops grow up in tiny cages without veterinary care and a chance to play with other dogs. (michiganpuppymills.com)
Too many dogs spend their entire lives in tiny cages, without love, just to keep the cruel puppy industry in business. (aspca.org)