Shortly before 11.30pm firefighters were called to reports of a fire in a flat on Whitecross Road in Warrington.
On arrival the crews discovered that a man and a dog were inside the property.
Firefighters rescued them both and administered oxygen to them.
Once paramedics arrived the man was taken to hospital via an ambulance. A vet was requested to attend to treat the dog.
A cordon was set up and two firefighters wearing breathing apparatus fought the fire.
Once the fire was out firefighters used a large fan to clear smoke from the property. They also checked that the fire had not spread to the roof space, using a thermal imaging camera to check for hotspots.
Firefighters were in attendance for almost four hours.
A joint police and fire investigation is being conducted into the cause of the fire. At this stage the fire is believed to have been started deliberately.
Anyone with information about the fire should call Cheshire Constabulary on 101, quoting IML 509950, give the details via
https://cheshire.police.uk/contact/general-enquiries or contact Crimestoppers anonymously on 0800 555 111.