Start with the deer. It's the only animal that gives you optionality.

In 2014, Christoph Janz wrote a post — “Five Ways to Build a $100M Business” — that’s still the cleanest mental model I know for picking your B2B customer. He followed it up with Three More Ways because the framework worked too well to leave at five. Read both.

The frame is simple: you can build a very large company by selling to very few huge customers, or to many tiny ones, or to anything in between. Each tier has its own physics — pricing, sales motion, financing, defensibility. Janz called the tiers animals.

   ARPU / year         animal               who they are
   ─────────────────────────────────────────────────────────────
   $1M+               🦕 dinosaur          a government, a national telco
   $100k+             🐋 whale             Fortune 500, sovereign banks
   $10k+              🐘 elephant          insurance, mid-market enterprise
   $1k+               🦌 deer   ←★      a car dealership, a mid-SMB
   $100+              🐰 rabbit            a single mall storefront
   $10+               🐭 mouse             a solo microbusiness
   $1+                🦠 microbe           end consumers, freemium individuals

The first rule: you don’t pick your animal once a quarter — you pick it for a decade. Moving up or down the chart takes 5 to 15 years. The infrastructure you build for one animal is wrong for the others. Sales motion, support, pricing, integrations, billing — all of it bakes the choice in.

Most companies stay in the lane they started in. A few break out:

• Tienda Nube started near the mouse — solo entrepreneurs and microbusinesses needing a storefront. Today they have much bigger merchants. The trip up took years, and their CEO tells the story in stages: prehistory, the long climb, then explosion. That kind of move is rare and slow.

• WhatsApp / Meta is the opposite playbook: start at both ends of the chart at once. Consumers (microbe) on one side, the API for dinosaurs and elephants on the other. Big-tech can do that because they have the capital to maintain two product lines from day one. You almost certainly can’t.

why the deer is the right starting animal

I’m biased, but I think most founders should start at the deer. ARPU around $10k a year. The math gets very nice very fast:

• 20 customers → default alive
• 80–100 customers → $1M ARR
• 300–400 customers → multi-million-dollar company

That’s a real business with a manageable number of customer relationships. You can know each one. Your sales motion is human but not bespoke. You’re not building custom software for every account.

The bigger reason: the deer is the only animal that keeps optionality.

• Once you’ve built for the deer, going down to rabbits and mice is a product simplification problem. You already understand the workflow; you strip it into self-serve. You know enough about the segment to know what to remove.
• Going up to elephants is a customization layer on top of a real platform. You know your engine works; you wrap it in services and SOC 2 and a sales rep who flies on planes.

Either move is hard, but they’re both available. Start at the elephant and you’re stuck building custom forever. Start at the mouse and you spend years burning capital before the flywheel even decides whether it’ll spin.

what kills the other ends

• Elephant-first companies often hit $5M–$10M ARR fast in LatAm and stall. The deals are big and bespoke, and they accidentally build a consultancy with software attached. Hard to escape.
• Mouse / microbe-first companies need very deep funding for very long periods. They have to nail self-serve, get distribution at scale, and survive the early years where revenue is thin. When they work, they go enormous; the survival rate is brutal.

Neither is wrong, but both are bets on a specific kind of capital and a specific kind of operator. The deer is the bet for someone who wants the company to be durable before it’s huge.

the rule

Pick your animal on purpose. Build the company for that animal. Plan to spend a decade with it. If you’re unsure — start with the deer. You’ll thank yourself when you need to move, in either direction.

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