I bought a bottle of cat bubbles from Sainsbury's. Just a word of warning if buying them from there - the bubble solution was really strange and left lots of sticky white marks everywhere they landed.

Came off fairly easily but the amount of fun that Smudge got from them at the time was ruined by all the cleaning I had to do afterwards.

They were the toughest bubbles I've ever come across though on the plus side and stayed in the air for ages