Dyson animal vacuums are designed particularly for homes with cats, dogs, and other pets.
You can compare Dyson DC25 animal and DC28 animal with the following charts, and get the difference between Dyson DC25 and DC28.

Dyson DC25 Animal vs Dyson DC28 Animal:
Vacuum Pics:	image from manufacturer	image from manufacturer
Vacuum:	Dyson DC25 Animal Ball-Technology Upright Vacuum Cleaner	Dyson DC28 Animal Vacuum Cleaner
Movement type:	Ball Technology	Fixed Wheel
Warranty:	5 year	5 year
Price:	about $490	about $540
Rating:
Detail:	#ad Customers Reviews at Amazon	#ad Customers Reviews at Amazon
Features:
Main Features:	Root Cyclone technology – Patented Dyson technology that doesn’t lose suction power as you vacuum. Ball technology – Steers smoothly with a turn of the wrist. Mini turbine head – Cleans pet hair and dirt from tight spaces such as upholstery, stairs and the car. Quick-draw Telescope Reach wand – Single-action wand with instant reach for stair and high-reach cleaning. Lifetime washable HEPA filter – Designed to trap microscopic allergens. Motorized brush bar – Powerful bristles remove dirt and pet hair from carpets.	Root Cyclone technology – Patented Dyson technology that doesn’t lose suction power as you vacuum. Airmuscle technology – DC28 Animal combines three cleaner head technologies, each precisely adjusting to clean every floor type thoroughly. Fingertip controls – Automatically adjusts (or de-activates) the brush bar for different floor types using a powered cam. No bending down. No awkward dials. Captures allergens. Expels cleaner air. – Dyson cyclones can capture particles down to 0.5 microns – including pollen, mold and bacteria. Mini turbine head – Cleans pet hair and dirt from tight spaces such as upholstery, stairs and the car. Certified asthma & allergy friendly – This vacuum is certified asthma & allergy friendly by the Asthma and Allergy Foundation of America.
Brushbar control type:	Fingertip brush control	Fingertip controls
Weight:	16.12 lbs	20.61 lbs
Product Dimensions:	12.2 x 14.2 x 42.5 inches	13.4 x 23.7 x 13.6 inches
Tools / Accessories:	Stair tool; Combination accessory tool; Mini turbine head	Stair tool; Combination accessory tool; Mini turbine head; Flat Out head
Suction Power:
Power Cord Length:	24.6 ft	35.2 ft
Power Rating:	220 Air Watts	245 Air Watts
Filtration:
Filter:	Lifetime washable HEPA filter	Lifetime washable HEPA filter
Dirt Collection:
Bag Type:	Bagless	Bagless
Bin Capacity:	0.31 gallons	0.61 gallons