These are too small for my (small) cocker bitch and would likely fit a Jack Russell sized dog.
Cost near £20 and are unused (cos I can't get them on her!) and when I requested a return to Amazon the seller just sent the next size (medium) and didn't want the other set returned.
Black with rubber sole & fabric sock with velcro fixings. Work well against nettles etc
Similar to these
Trixie Walker Active Protective Boots, Medium, Black: Amazon.co.uk: Pet Supplies
Collect (North Bedfordshire) for free or £3.95 by Royal Mail 2nd class signed for.