We've been bringing our lab here for 5 years for regular appointments, shots, ear infections, and also boarding. Everyone here is great! Super friendly and knowledgeable front staff, vets who don't over-medicate or over-charge, and assistants who really seem to care about the animals. I recommend Summerlin Animal Hospital for any vet treatment. For boarding, it's not a pet resort...but you're not paying pet resort prices either. Our dog is always excited to go there, and I do believe he is treated well.
Overall, it's an easy decision to give them 5 stars. I'm not sure where all the negative reviews are coming from, but speaking for myself we are very happy!