I also like the functionality and look of the site. The images are clear and the writing descriptive. I would definitely move the navigation over to the left and move the search function to the top. Get rid of the drop down list and make it a part of the navigation. I would also add navigation across the top using the most important information, i.e. contact, cart, home, etc. Add your phone number and address somewhere up top. I believe it simply adds trust when people know they can call and see you have a location (whether it be a PO Box or physical address). Last, it seems your best navagation is on the home page. Make sure to create a link back to it if it has the most functionality.

Also compare your pricing to other competitors. Are they offering free shipping, better prices, or coupons?

I think its a little complicated. There's huge amounts of information concentrated on one page - try condensing the nav and add some extra pages for the overflow - more pages - good for seo! I personally would probably move on to the next site simply because there is so much going on here.

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The sign "no dogs except guide dogs" who's benefit is this for?

www.lefthand-marketing.co.uk