So... this is a case where everybody involved has ignored the rights of the others. Your photographer friend owns the photographs, but without a release, he does not own the right to commercial exploitation of the dog's image. (In other words, he has no legal right to sell his photograph unless he crops the dog out if it.) The breeder has no right to use the photograph, but he controls the right to use his dog's likeness.
This sounds like a case that could go sideways really quickly, or ... since everybody would benefit from an amicable agreement, they could all sit down and agree to cooperate with each other. And then get a lawyer to draw up a rights agreement that allows the photographer to use the images of the dog in exchange for the breeder having the right to use the photograph of the dog.
There is no specific law in the US that requires a property release and model releases only apply to people, not to animals, which are property. While it might nevertheless be prudent to obtain a property release in some cases, even if there is no specific requirement to do so, I do not believe that having a property release is a guarantee against a property owner trying to sue.
The ASMP info cited above is a good place to get an overview of the matter. The ASMP has its own legal counsel.
As for getting a lawyer to draw up a rights agreement, professional photographers draw up such agreements themselves, without recourse to a lawyer, all the time. I see no need for a lawyer for such a purpose if the terms are fairly straightforward, which is usually the case. When things start to get complex, by all means get a lawyer involved. Again, the ASMP has some excellent resources related to the licensing of images, as well as other matters related to the business of photography.
Typical license terms might look something like the following:
1. Photographer retains copyright to the images and reserves all rights
2. The period of use is 1 year
3. The territory of use is the United States
4. The medium of use is the Internet
5. The license to use the images will not be in effect until the invoice is paid in full
6. The license may not be transferred to any third parties without the written consent
of the photographer
7. The usage license is non-exclusive
The fee for the above license is $X,XXX