Handsome dogs you've got there! Welcome to the forum!
To post pictures, you'll need to include the full URL for the photo you're posting. You can find that by right-clicking on the photo and choosing "properties."
If the URL ends in either .gif or .jpg, you can usually post it using the image tags. If that doesn't work, it usually means that the host of the photo doesn't allow remote posting.
If it doesn't end in .gif or .jpg, sometimes html tags will work, but I'm not really html savvy (trying to learn) so I can't help much with that.