My golden doodle has been wearing a variety of Ruffwear boots and accessories since his first winter back in 2013/14. Now 11 years later, he's still sporting a nice set of boots but he has a little brother who has much bigger feet and hand-me-downs wasn't going to do the job. My new pup is half St Bernard and has the feet to prove it! Big and thick he's been a harder fit than the doodle! I had to go up a size from what I ordered just to accommodate his thick pads. The 3.25s for the front paws are a bit big and he could probably do with 3.0 for both front and back, but he's only 9 months old, 105 lbs and still growing! My guys can play fetch in their boots, go on hikes with them, dig in the snow with them! Once they get used to them it's like they don't have them on. And this particular style stays on really well without getting tangled in their long leg hair like the higher boots with front zippers. Those were hard to manage with hairy-legged dogs!!