I phoned to add my second dog to our insurance policy yesterday. The girl suggested I apply for a quote on line as there was currently a discount. By the time I had completed the exercise on line, due to the online only discount, it cost the same for two dogs as it had before for the one!
The other company I had one month free insurance with from our breeder had quoted me more for each of the dogs on their own and the cover wasn't half as good!! Good insurance company though.
I'd say shop around or look out for an online deal! At worse you could use a new quote to try and negotiate with your current insurer
My dogs cost the same or a little more than yours and the year's cover for them both is £182 at
www.eandl.co.uk sadly that will no doubt go up next year without the discount but you could always get a quote from them before you make a final decision.