Not great. Will stick to original kong.
I think my lab & goldie must both be daft because there was no way they would use these. Tasty treats popped inside, tipped it so they knew where they came out, tried to pretend to get them out myself, left it with them whilst I went out. Nope treats were left untouched. For me I have two useless lumps of plastic in the doggie box. The original kong is so much better. This is also very heavy.