This collar is great!! It is very waterproof and durable. We go camping almost every weekend and our black lab swims and runs around in the woods and it has held up great! We can always see him. The one thing that I have noticed is that the collar gets a little loose after a few days of wearing it? has anyone else had this happen? I may need a smaller size? I bought a Large for my 78lb Lab. He is only 1 1/2yrs old so I might need a Medium they seem to run Large. Get this if you have a hard time finding your dog at night. It has truly saved his life a few times.