
I would doubt that this is a 'breed' thing, more like environment than genes, although some breeds are more likely to chase cats, like hounds, terriers and huskies...so why not visit the rescue centres and ask for a 'cat tolerant' dog??? Not all dogs act as expected, a friend rescued a really frail greyhound and was careful to keep it secure from her cats, only to find one sleeping in the kennel with the greyhound, who despite being a retired (and very abused) racer was perfectly fine with cats. Fair enough greyhounds don't like long walks, but just an illustration of how not to assume all dogs act as their breeding may suggest.
I think it's great that people will take on an older dog, who's probably bemused at being abandoned

How can people do it? Well apart from dying there's no way I'm parting with my guys and if that happens there's money for them to be cared for....