Here's all of them (automatically scraped & calculated):

Megasloth: 160, Thrumbo: 160, Elephant: 160, Rhinoceros: 120, Cow: 96, Muffalo: 96, Bison: 96, Horse: 96, Grizzly bear: 86, Polar bear: 86, Dromedary: 84, Elk: 84, Yak: 84, Boomalope: 80, Pig: 68, Donkey: 56, Warg: 56, Deer: 48, Alpaca: 40, Ostrich: 40, Caribou: 40, Ibex: 40, Cougar: 40, Panther: 40, Wild boar: 36, Timber wolf: 36, Arctic wolf: 36, Husky: 36, Goat: 33, Sheep: 33, Capybara: 33, Labrador retriever: 33, Gazelle: 31, Turkey: 28, Emu: 28, Cassowary: 28, Lynx: 28, Fennec fox: 27, Red fox: 27, Arctic fox: 27, Goose: 26, Tortoise: 25, Alphabeaver: 24, Raccoon: 22, Iguana: 22, Chinchilla: 21, Monkey: 21, Cat: 20, Yorkshire terrier: 20, Cobra: 18, Hare: 16, Snowhare: 16, Squirrel: 16, Rat: 16, Boomrat: 16, Guinea pig: 16, Chicken: 0, Duck: 0

Also, in case it's helpful, here's an adaption of the interpolator I used on Template:Animals/Row for the baby meat yield, as it has the same post-processing curve as leather yield:

{{#vardefine:pre_curve_leather_yield
| {{#switch: {{{name|}}}
| Goose = {{#expr:36*{{{bodysize|}}}}}
| Chicken | Duck | Spelopede | Megaspider = 0
| #default = {{#expr:40*{{{bodysize|}}}}}
}}
}}
{{#vardefine:leather_yield
| {{#ifexpr: {{#var:pre_curve_leather_yield}} > 40
| {{#var:pre_curve_leather_yield}}
| {{#ifexpr: {{#var:pre_curve_leather_yield}} > 5
| {{#expr: (40-14)/(40-5)*{{#var:pre_curve_leather_yield}} + (40 - (40-14)/(40-5)*40)}}
| {{#expr: 14/5*{{#var:pre_curve_leather_yield}}}}
}}
}}
}}