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Dogs are also far more expensive, in both cost of care and time/labor.

There are many places in the US that have more of a problem with feral cats than rodents (which doesn't happen with dogs as much here). Some trap/neuter/release programs exist for these, but they struggle. Often the only service they provide the community - beyond simply neutering the wild cats - is a steady supply of pet kittens (also made sterile). I'm sure many people involved would love to see the wild parent cats actually made useful for something, which could also help reduce the problem of the thousands of unwanted cats that are euthanized every day.