why the forget did you own 12 cats? fostering them or do you seriously own 12 cats jesus lol
you can definitely have the dog put down, and possibly charge the owners.
we once had 24 stray cats
they stayed around our place all the time because we fed them cat food and gave them water
one had kittens in one of our walls
but one day, one of them had some disease that was like felininesomething and we didn't have enough money to get medicine for them
most of them moved on with their lives (I know I said in other topics they "ran away" but basically it's the same thing, it's just I didn't own them) and a little bit of them died from the disease spreading around
we then had one last cat left named Samantha, she was one of those black and white cats that laid around the house, but she ended up getting eaten by the neighbor's dog who ended up getting hit by a car a few years later.