This simple modular pet house is made of environmentally friendly expanded polypropylene (EPP), which helps to prevent pollution. It is harmless and therefore suitable for pets. Based on the modular principle, the modules can be used like blocks to build a house. Depending on the number and needs of the cats, the house can be assembled to have different lengths. The material is light, soft and elastic, yet stable. A colourful cushion, which is comfortable and warm, can be placed in the grey-coloured corpus.