That depends on the specific bed, so look for an explicit statement about a removable cover and its washing instructions. A visible zip may provide access to filling during manufacture rather than indicate routine owner removal. Ask the retailer if the listing is unclear, and check whether the cover, cushion and bolster are separate pieces. If the cover is removable, find out how it should be washed, whether it can be tumble-dried and whether a replacement is available. The inner cushion may still need spot cleaning or a different drying process. Do not cut seams or pull apart a stitched construction to make it washable. For a large cat bed, ease of removal can matter as much as the wash setting because a very tight cover may be awkward to refit. Clear care information makes comparison more useful than a general easy-clean description.
Before the first wash, photograph how the cover fits around corners, cushion sections and fastening points. That makes refitting easier without guessing how the original layers were arranged.
For product comparisons alongside this advice, see Velvet Nest and Silver Velvet Nest. The details below explain their sizes and uses.
Velvet Nest
Silver Velvet Nest
AeroMat Chill Pad