Is there any way to remove pet's ownership?

Previously I make all my animals has their owner except the cats. Now when I'm thinking of keeping only goat, sheep,dogs and kill others. I realize I can't cancel ownership.
After searching on Google, I found some ways:
1.Kill the pet with magma or trap etc... ,but will make dwarf unhappy
2.Kill the dwarf, but almost EVERY dwarf has pet, means I need to kill every dwarf.
So, is there anyway to turn the pet back to "no owner" condition? Like mod, dwarf therapist, DFhack, or change through the raw files ?
Best Answer
Once a pet is given to a dwarf (or in the case of cats, selected by a cat) then you have no power to change it other than letting the dwarf succumb to some !!!FUN!!!.
Once the fun has occurred, you may assign the animal to another dwarf, or butcher / pasture as required however they will keep their name.
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How do I get rid of my pet?
The best way to get rid of a pet you don't want is to take it to your local animal shelter. There are many non-profit groups that run shelters for animals you can no longer care for. By simply opening the phone book or doing an internet search you can easily find one.What is responsible pet ownership?
The BSAVA considers that responsible pet ownership includes: Committing to the responsibility of providing for the animal's welfare needs for the life of the pet. Recognising that the ownership of a pet requires an investment in time and money, which can be substantial over the lifetime of the animal.Are there any drawbacks to pet ownership?
Consider that pets can get sick, causing unplanned medical expenses to add more costs to keeping a pet. As pets age, they are prone to developing medical conditions requiring additional vet visits, testing, medications and medical procedures, which can add up to considerable expense.How do you transfer ownership of a dog in Ontario?
Previous owner does not need to provide anything in writing....The new owner will need to register their new pet and can do so by:Clean Pet Hair for GOOD! How to Clean Up After Your Pets!
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