When selecting the best Dyson cordless vacuums for pet hair, it's essential to consider powerful suction capabilities and various features suited for mixed surfaces. For medium-sized homes, these options balance performance, runtime, and advanced features.

1. Dyson V15 Detect Absolute: This model excels with laser detect technology to reveal hidden dust and an upgraded Hyperdymium motor providing robust suction power. It's perfect for pet owners with mixed flooring due to its intelligence and automatic surface adaptation.

2. Dyson V11 Torque Drive: Known for its dynamic load sensor that adjusts to different surfaces, the V11 offers excellent performance on both carpets and hard floors. Its high-capacity battery makes it ideal for medium size areas.

3. Dyson Outsize Absolute: With a larger cleaning head and bin, it's tailored for broader areas. Despite being slightly heavier, it offers unparalleled coverage and suction efficiency.

4. Dyson V10 Animal: This model is dedicated to tackling pet hair with its Motorbar cleaner head engineered to pick up pet dander and hair effectively.

5. Dyson V8 Animal: While an older model, it provides a budget-friendly option without compromising on Dyson's reputable performance and reliability.

Both the V15 and V11 models offer features like advanced filtration to capture allergens and provide cleaner air, which is an added benefit for households with pets. Their advanced sensors and adaptive cleaning modes make them user-friendly for various surfaces and pet-related messes.