Since you have got a pet shop, I guess it's better if you start accepting bitcoin through Lightning Network; best for micro payments. You will get-
- Instant Confirmation (You are unlikely to wait for confirmation.)
- Low Fee (Your customers are unlikely to pay higher fee for a small transaction.)

Lightning Network can be the best solution for shop you referred.

If you need to learn more- A Beginner's guideline to Bitcoin Lightning Network
More interested; try Lightning Network with testnet BTC- [Tutorial] How to create Lightning Network Channel (Testnet BTC)
If you have got some questions to ask, don't hesitate. Go to the thread I referred & share your query; will gladly assist as much as we can.