What's the best kayak for a 250lb man with a 100lb dog?

Question

I need some help finding the right kayak. I weigh 250lbs and I want to take my German Shepherd with me who weighs about 100lbs.

Any idea of what is a good kayak? I'm going to be in the Pittsburgh Pennsylvania area kayaking on rivers and creeks (not whitewater).

Thanks for any direction.