They are Pawz (large size) balloon shoes. I bought them off amazon originally and then got another set at Petsmart. The only problem with them is they're disposable. I leave with 4 and come back with 2-3 due to tears depending upon how much he runs around. Here's an amazon link.

https://www.amazon.com/dp/B001J1W76O/ref=twister_B08WJC4QFD?_encoding=UTF8&psc=1