Cover image for Petoi Robot Dog Bittle

Petoi Robot Dog Bittle

A great STEM robot dog for learning and playing

⭐️ ⭐️ ⭐️

12 February 2023 by Kevin McAleer

👍 Recommendation

A great, if not slightly expensive, STEM robot dog for learning and playing. The Review Score is only really let down by the excess packaging; otherwise, this is a solid buy decision.

Bittle Review

Meet Bittle, the Palm-sized Open Source Quadruped Robot Dog. It has impressive performance for such a tiny package. Moreover, it is highly programmable with the lifelike animal behaviours of a four-legged robot. Bittle is the evolution of the OpenCat project, initially developed by Petoi founder Rongzhong Li.

Bittle and Opencat

It’s aimed at adults or children under supervision (14+), so this is quite like the Lego Brainstorm kits that were available up until recently.

Part of the fun with this is in constructing the robot and then learning how to program it and extend its behaviours.

Features & Functionality

  • Programmable
  • Multiple language support - C++, Python & Scratch-like block coding
  • Highly extensible with Raspberry Pi & Arduino ecosystems
  • The Onboard Arduino-compatible processor can be enhanced using a Raspberry Pi (not included!)
  • Four legs for movement

Bittle features

What’s in the box

What’s Included:

  • preassembled package
  • construction package 1
    • Servos
    • Body
    • Battery
    • Remote
    • Screws & tools
    • Calibration tool

Compare box contents

User instructions & Documentation

The instructions are available via the Petoi website and can be updated long after the product is shipped. The documentation is available in a couple of languages too.

Ease of use

Bittle is suitable for adults and children over the age of 14. Kids can enjoy playing with Bittle under the supervision of an adult.


Bittle is widely available (worldwide); the Developer model was unavailable for purchase as of the time of this writing.


The design of Bittle is a clear evolution and improvement on the original Opencat robot. The parts are sculpted, moulded plastic and fit together perfectly, and the proportions are pleasing to the eye. The colour combinations work well together and complement each other. The tail is a particularly nice touch.


The price for the preassembled robot is $248.99, and $231.99 for the construction-only version. There is also a Developer version for $368.99 USD2.

Version Price
Preassembled $248.99
Construction $231.99
Developer $368.99


Bittle is available in 3 colour combinations:

  • Black, Yellow and blue
  • Black, Yellow
  • Black

Build Quality

The build quality is excellent, the parts snap together nicely with a very close fit, and the overall fit and finish are high quality.

The springs on the foot mechanisms are excellent and give the feet some bounce and responsiveness.


One thing of note about this product is that this is a lot of largely unnecessary plastic packaging. Plastic packaging will likely hold all the parts in place during shipping; however, other companies have found ways to do this with cardboard rather than plastic.


I checked the website and tried looking for a statement about the environment design, production, packaging, delivery or disposal of the product. There was no environmental policy or clean energy use that I could find.

Review Score

Below is the Kevs Robots review framework. First, each product is scored out of 5 for each of the 9 areas. The total score is then calculated by adding the scores for each area and dividing by 9. The total score is then rounded to the nearest whole number.

Scoring area 1 2 3 4 5
Price Very Expensive, verging on not worth it Expensive, but worth it for the value add Affordable, similar in price to competitors Cheap / great value for the parts and features Free / Very low cost
Ease of use Hard to use, complex operations requiring multipe steps Many steps, some of which as complex. Some steps to construct or operate, some of which are complex Few steps, simple to do Very easy to use / use is obvious and clear
Functionality Very little innovation or usefulness Does less then you’d expect, but still useful Practice, does what you expect but no more Quite a few innovative functions, does more than you’d expect Amazing features & innovation, industry leading
Availability Very difficult to get hold of any variation or version Little available; some variations or versions are available Available in some countries and stocks mostly available Available in most countries & mostly in stock, short wait for stock replenishment All versions and variations widely available in all countries & in stock
Aesthetics Design is not pleasing to the eye; poor colour choice, parts do not fit together, no cohesive design Design is acceptable, some elements do not work together well Design is functional, no overall cohesion Design is functional with some flair, most elements work together well Very pleasing to the eye, complimentary colour choices, great fit and finish, with an overall cohesive design
Build Quality Poor construction, with gaps or overlapping parts. Poor quality materials used Functional construction, cheap materials Functional construction, acceptable materials used Durable design, some parts are high quality, most are acceptable Solid construction, parts fit together as intended with no unexpected gaps or overlapping parts. High quality materials and parts used
Documentation Single language instructions, no diagrams, basic features only Basic instructions, technical specifications in a few languages, little no diagrams, no example code Basic instructions, technical specifications in a few languages, diagrams for use. Some example code Documentation available in multiple languages, with all features covered and diagrams for use. Some example code Documentation available in multiple languages, with all features covered and simple diagrams for use. Mechanical and circuit diagrams also included. Example code. Advanced topics covered too
Packaging Little to no thought given to environment. Wasteful use of space leading to higher shipping costs. Excess layers of packaging Some thought given to environmental packaging & recycling. A few layers of packaging Some thought given to environmental packaging materials & recycling. Single layer of packaging Environmentally friendly, packaging designed for recycling with some effort. Packaging is has mostly efficient use of space to cut down on shipping costs Environmentally friendly, packaging designed for easy recycling. Packaging is small with efficient use of space to cut down on shipping costs
Environmental No consideration given to sourcing, production, supply, delivery or disposal of product, with toxic chemicals used in production No consideration given to sourcing, production, supply, delivery or disposal of product Product is efficient to operate, but may have poor environmental production or disposal impacts Most of the product is sourced from recycled materials, no toxic chemicals used in production, some thought given to production and delivery energy used Product is sourced from 100% recycled materials, with no toxic chemicals used in production. produced with clean energy, packaging designed to lower delivery costs and disposal of product is taken care of

total is 3.7

🎁 See the transparency notes for details.

  1. Experience with coding is recommended for correct configuration and the best performance of Bittle. 

  2. Prices correct as of February 2023 

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