Missionary with medium to large dogs is fairly easy & achievable.
Key items needed are, a bed approximately 2 feet high, slightly firm.
Night stand or whatever handy, (my preference is an adjustable expansion bar from Harbor Freight, secured between closet walls), with screws once you've determined the prefect position for your feet to rest & 'Brace' against, approximately 2 feet high, & 2 feet away from the bed. This creates an access way for dog, while receiving lover lays bed with booty hanging slightly off end of bed for k9 to easily access. (The crossbar idea, gives dog more freedom of movement & less appearance of a trap or restrictive zone then a night stand.)
With your feet resting/bracing on the crossbar/nightstand, you can spread your legs, allowing k9 to enter between, investigate, & mount the prize. A towel tossed over waist & belly can help guard against scratching from his passion driven claws. His regular cum stained play towel from previous sessions can be very helpful for his instincts. Once his goal has been achieved, the towel can be gentle pulled & tossed aside allowing full chest contact as lover is giving full-on French kissing while breeding.
Receiver can use feet on crossbar make slight body adjustments for prefect alignment for entry, rather then hustling/shuffling & tiring to keep knees & legs held up in the air. Receiver can tuck heels, to limit thrusting as needed, & knees to keep lover balanced or dismounting too soon.
Precautions; #1, only attempt with k9 you are well bonded with, that trust is fully mutual. Mine have ranged from 65#-120#
#2, that crossbar,?, has worked exceptionally well for my scene, yes. 5 foot wide closet, 2 feet from bed, strong plywood walls, (not sheetrock). Things just fell right into place, perfectly! Yes, I did remove the bi-passing doors. If you are a strong orgasimor, lose of muscle control during your HIGH Point, you could easily buckle that cross bar. Plz tailor to your individual scene, imagination & comfort. ' 1 inch water pipe'?
Oh, yeah, ok, For the original posting. Yes, this position IS more difficult to get a real good view of for filming. It's really all about the comfort, satisfaction, & gratification of the lovers. Not so much the audience. Added benefits if the audience is also participating.