My Cloud (zochor) and Fluffy (nekeva) are both intact. However, there always is and always will be a market for polar bear cubs, so I do not have to worry about abandoned offspring.
Actually, I kept pure-bred Siamese for that reason – I had no desire to make even a penny on selling highly desirable kittens, so I knew I would always be able to place them. For some strange reason, my female had only one viable litter, so it hardly mattered.
Chana: Nope. Neutering is Assur even for a Goy so giving it to a vet to neuter is Lifnei Iver. They say that Lifnei of Lifnei is Muttar, so you could give it to someone else to give to a vet, but I think some Assur that as well. Just buy a pet that’s already “fixed”. There’s nothing Assur whatsoever about that.