"Yo quiero tener un perro."
Translation:I want to have a dog.
for "i would like" you can say "yo quisiera tener un perro" or "yo querría tener un perro"
Sadly our world isnt ready for this sort of thing. Humans have babies, dogs have puppies. Maybe someday... Until then we can only dream that one day interspecies birthing and surrogacy will be acceptable and possible.