Abstract: Hideaway pet ramps of the present disclosure are collapsible, discreet, and greatly facilitate access for pets onto beds, sofas, vehicles, and other elevated areas. This access can be greatly beneficial for infirm, geriatric, overweight, and small pets. Advantageously, pet ramps of the present disclosure also reduce the likelihood of injury for pet owners, such as injuries from lifting an animal onto the bed without the benefit of a ramp. Pet ramps of the present disclosure generally include a thin, rigid housing that discreetly fits underneath a mattress without compromising the comfort of the mattress. The housing forms a pocket configured to store a telescoping, height-adjustable and length-adjustable ramp assembly having an upper slide assembly and a lower slide assembly that may be deployed at any time a pet needs access to/from the bed.