The man, a 48-year-old from the Baltic island of Gotland, had been cat-sitting for a friend of his who was in prison.
When the prisoner emerged in March and managed to set himself up with a place to live, he asked for his two cats back.
However, the 48-year-old had become attached to the feline friends, and refused to hand them over at a meeting in the ex-cons apartment.
He left in a rage, later returning with a samurai sword which he stabbed deeply into the door, before threatening both the ex-cat owning ex-con and his landlord.
Police were called to the scene. Two witnesses alleged that the man continued to make threats as he was being apprehended by police.
He has been sentenced to six months prison by the Gotland Court for assault and criminal damage, and has been asked to pay 22,000 kronor ($2,959) to one of the threatened men, 10,000 to the other, and 2,000 to the Gotland housing association for the damages, wrote the Gotland Allehanda newspaper.
Both cats lived to tell the tale, according to the TT news agency.