If, like me, you've stopped going to the National Botanic Garden of Wales because they don't allow dogs you may be interested in this:
http://www.gardenofwales.org.uk/whats-on/events/
“Saturday September 28: Doggy Day – after the successful trial in March, we are repeating this special event which allows you to bring your dog with you on your Garden visit.”
There may be another doggy day in December.