CrossedDestiny
Citizen of Zooville
I am as thick as a large pony friend, I would know, because we have a pony stallion, not bragging (well maybe slightly), but as long as you go for a large breed, you will be fine. Think Malamute at the smallest, but better a Great Dane, Mastiff, etc, and you will have no problem. I fit into my rottweiler just perfectly, back when i was 18-19, though it was admittedly tight, just make sure to use lube religiously, and go slowly.Me personally. I'm not into m/m zoo so me letting a k9 or otherwise mount me is not happening.
As for a female k9 I have been told I am girthier (is that a word) than most, and I know what peeps will say, but I would be worried about hurting my lover.
I have had human females rethink getting in bed with me.
The people who have problems, are the ones who get excited, and go fast, ram in with no patience, or get frustrated and force the situation, don't be that guy. think with the upper head, not the lower one.