Go with what Arty Farty says. It is the frequency not the amount. Homeopathics, bach and bush flowers have specific frequencies so you could basically take the whole bottle and it will only have the same effect as the required dose, ie you can't really overdose. If an animal is really needing emergency essence for whatever reason you can dose more frequently, ie every half hour if need be. Just go with the instructions (or for more detailed instructions do a search on the web). I have also used emergency essence just in their water too especially when introducing new pets into the environment.
Generally bach flower remedies work for people/animals that have ancestry back to Europe whereas if there are a few generations born in Australia - then the Aussie bush flowers often work better.
These types of natural remedies work really well on people, animals - I have tried them on myself, my daughter (great for teething), horses, dogs and cats and usually get pretty good results.