What happens if a dog sleeps on the floor in summer?

A dog sleeping on the floor in summer feels fairly comfortable, because surfaces like concrete and tile feel cool and effectively absorb and disperse heat, somewhat reducing the chance of heatstroke. However, sleeping long term on rough, cold, and dirty floors may affect the dog’s skin and joints, easily causing skin wear, dermatitis, eczema, and other skin problems; joint-sensitive dogs or seniors may develop or worsen arthritis.

Finally, the floor may hide external parasites like fleas and ticks, so a dog sleeping directly on the floor also raises its risk of contacting and being infected by parasites.