Sticking with the theme?

Just thought I'd ask, if you have a niche that is more specific, do you ever deviate from the main theme?

My own niche is dog clothing. I started my website, progressively adding more content in October and, so far, I've blogged about Halloween dog costumes, throwing Halloween dog parties etc. I did keep it quite narrowly concentrated on Halloween, and the costumes available for dogs, but branched out slightly by including recipes for treats and cake for the dog party.

Now, we are getting into the cold weather I'm starting to promote winter clothing but also, because it interested me personally, I've blogged today about the dangers of hypothermia for your pet dog. It sparked some other ideas that might be good topics for future posts on my website:

• patterns for making knitted/fabric coats
• donating to dog rescue during the winter months
• food recipes and supplements to keep your dog healthy in cold weather

I suppose what I'm asking and would appreciate any comments about is how far should or would you deviate from the main themes of your chosen niche? Some of the blogs will not have product links but I was thinking of putting on a couple of charity links

I think my hypothermia blog is quite relevant as I could talk about suitable products available for your pet and also give advice and tips on prevention and treatment. http://cuteclothesfordogs.com/

As always your comments and thoughts are much appreciated :0) thanks peeps Jan