I have a question about these transports?

There are some postings on craigslist here in RI recently.

1. Woman adopted a GSD from 'archies rescue,' dogs were brought up from the South. The dog had all the vet papers but had not been tested for heartworm. And when she took the dog in to her vet, they did the test and found it was Stage 3 infested. She is doing the treatment, but furious with the rescue that she didn't know in advance.

Do transported dogs not get tested for heartworm? Or is it that particular rescue? Folks have been replying to the original poster that she should have researched the rescue better before hand. Do you as a transporter worry about what you may bring home to your pets? So I was just wondering?

2. All the photos everyone on here posts of the transport dogs, the dogs look very nice. Several people on craigslist are getting their dogs matted and dirty, covered in feces etc. and need to clean them up themselves.

Is that the rescue group? I am thinking that is what it is.