They fall apart very quickly.

As cute as these are it's not worth taking a chance with your pets life. I bought these for my cat, they are adjustable and have a clasp to keep them closed. The problem is that being adjustable means they can expand or retract while on your pet especially if they get caught on something. We were lucky, on our first day of having one on our beloved Mr. Metz he had jumped off our bed and somehow got his leg sorta stuck in the collar making it pull to ghe point of chocking. It was 3am and I geard him struggle for air and vomit. When I check there was nearly no space to get a finger in between his neck and the collar. Again, we were lucky that I'm a light sleeper, my husband slept through the entire thing. We could have work up to our little guys having chocked to death. My advise, buy something that is fitted to your pet and closes with easy velcro. I previously worked in children's apparel and had to be extra concerned with hazards like this, silly me not to consider the same dangers for my pet.