I don't unfortunately, but it *should* be relatively simple to buy a canine plushie and then just sew an SPH/sleeve for a fleshlight, or you could look for someone who does stuff like that. But outside of that I can't help. Sorry.
like others have said, converting a SFW plush is the way to go. There are furries and small companies that will convert it for you in a more permanent and less DIY way, if you want something higher quality.
One option is to get something off of hawtfur. They do custom modifications on plushies with many options to choose from. I've not personally ordered from them but have been contemplating doing so recently