Foxes are strange in the way that it would be hard towards impossible to litter train them, however if you have a cat or a dog that is litter trained the fox will (if you purchased it as a youth) learn to do the same.
Foxes have one litter of kits per year, usually in the spring.
Gray foxes will have one litter of kits each spring.
they can at least have 5
Yes you can litter box train a lamb. people in Germany do it all the time.
Female red foxes will have their first litter of kits when they are barely a year old.
Yes.
To litter train a kitten all you have to do is show them the litter box and they will naturally go in the litter box. thats what my cat did. she was never taught. this is not a stupid answer so dont say it is
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no
No - you can't.
If you mean "can you litterbox train a Chihuahua?", the answer is yes.
Arctic foxes may have litters of up to 25(!), the largest litter size in the order Carnivora.