There are 7 occurrences of 'dog training' on your homepage. I really don't think that's too many on a page with a medium amount of content.

That being said, I would put your #1 targeted keyword phrase into your h1 tag.

You mention the keyword "dog" as your main keyword. I am not a SEO expert but i would suggest aiming for a long tail keyword as your primary choice.

With single word keywords you are one of millions of sites and the traffic might not be interested in dog training. the longer tail keywords will bring you more specific and targeted traffic.

If you have not used it before google keyword tool is free and can help you get a basic idea of keyword searches and competition for that keyword.