Those are cute pix. I'm glad you're enjoying yourself while helping out animals in need.

As for your question about bringing doggie diseases home with you, that is a concern. Shelter dogs frequently come in with unknown vaccination histories and are not always well cared for to start with. Things like Parvo, Kennel Cough and other things can be brought home to your pets.

You're doing one thing right already by making sure to come home and shower and change before playing with your own dogs. Make sure the dirty clothes also go somewhere the dogs can't go like a basement or spare room. Also when you come home, take off your shoes and carry them to a place your dogs don't go. It's possible to step in something at the shelter then track it over your carpet when you walk in. Make sure your dogs are up to date on all their vaccinations.

If you are doing all that, you should be fine.

I've worked at the vet hospital for 7 years and done all that and my kitties have never caught anything I've been exposed to at work.