Did they conclude that it worked?

They concluded that it did help the nervous dogs (they weren't perfect, but
they did exhibit more 'relaxed dog' behaviors and it was significantly
(statistically) better than the placebo group.

There were however some potential biases in their research which I wasn't
totally happy with, so I'd like to read more on it, but nothing fatal (among
other things, there was the potential for the experimenter to discover what
the treatment was, also the experiment didn't run over an extended time
period, so other conditions on the day might have had an impact).

Dale