How would a trans woman bottom for a male dog?

Late to the party but it might help someone else. As said above. Same way anyone would. Be it cis girl, or guy, or anyone. As long as your dog partner is mature and interested in sexual activities, it should be quite simple to get the right mood on. Get playful with him, play fetch, cuddle, play game of tug, whatever makes both of you excited and playful. From that it's not that big of a step to getting mounted. There are some more better guides here, if you need one.
He is really unlikely to mind that he is having anal sex (assuming you're not after op). As for you, just make sure to prepare. Get clean, and perhaps practice on some toys, preferably inflatable ones. He will stretch inside you and it will be quite a lot, so be sure that you are comfortable with it, because once you are anally knotted, chickening away will be painful. Also, try to keep him calm, you don't want him to make some sudden moves and literarly rip it out of you.
Be safe and enjoy
 
What are you actually asking? There are 2 kinds of trans women. Pre-op: still possess penis and testes. And Post-op: those with a neo vagina or zero depth vulva.

Pre-op and ZDV have to couple anally. The anus and colon can accept a penis and a knot. Training will be involved.

Post-op neovaginas have as much variance as cis vaginas. Only a small percentage are deep enough to accept a 7-8" male cock. The dept of the individual trans woman will determine whether or not she can accept a knot in her vagina. **As for scent and smell: Post-op women give off estrogen influenced pheromones, their vaginal flora similar to a post-hysterctomy cis female. Some self lubricate better than others. And if their genitals had a scent prior to surgery, that scent remains, typically a mix of their chemistry and all of their partners. Enticing male dogs just as much as cis women.
 
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