We participated in a summer tour of the kennel, foregoing the sled (golf cart) ride. Even though we opted out of the ride with the dogs, our experience was top notch! Our guide, Blake, was very knowledgeable, friendly and clearly loved and knows each individual dog very well.
Be prepared to be slightly dirty when you leave a summer tour; it's dusty and the sweet pups love to jump and lick (in a good way!). It was wonderfully interactive, we were given advice on each dog's personality (i.e. give them space or give them lots of belly rubs!). I have a 12yo son on the spectrum and he was incredibly nervous about what to expect, the physical interactions with the dogs, etc. and he did GREAT and it was his highlight of our entire Colorado trip.
It looks intimidating pulling in; SO many dogs to see and take in, but the tour is structured in a way that makes each section totally enjoyable. The dogs were GREAT with my two kids (12yo & 10yo). We would absolutely participate again if we're ever in the Breckenridge area!