There's also this one, with a bigger button and heart shaped! https://www.amazon.com/dp/B00C5SGHW0/ref=cm_sw_r_cp_apa_i_y8GgFbD48YRNW

It looks like you can do the same with "voice record buttons" like easy buttons too for a little cheaper https://www.amazon.com/dp/B00HT5HBMO/ref=cm_sw_r_cp_apa_i_R.GgFbVZHD1GG

You can get these on Amazon and program them with your own voice

https://www.amazon.com/dp/B00HT5HBMO/ref=cm_sw_r_cp_apa_fabt1_e0YXFbPJH1RBT

I started my dog at 5 months old on two buttons, “outside” for bathroom breaks and “hungry”. I get mine off of Amazon their much cheaper than fluent pet and I just write the word in white paint pen on top. She initially learned based on their position but 2 yrs later she’s since learned to differentiate between the words and will sometimes move the buttons around so that her favorite ones “hungry” “outside” “train” “cat” “right now” and “up” are all together and in the front so they are easier for her to get to. This video is older, and she now has 20+ buttons, so I let her adjust the buttons however she wants, so she can better communicate.

When you start, use two different colors and clearly label them with a word or symbol. And even if the dog hits the wrong button still give them what they asked for via button to reinforce the button they hit. Otherwise they will struggle to learn them.

Here’s the link to the buttons I buy: Learning Resources Recordable Answer Buzzers - Set of 4, Ages 3+ | Pre-K Personalized Sound Buzzer, Recordable Buttons, Game Show Buzzers, Perfect for Family Game and Trivia Nights, Dog Buttons for Communications https://www.amazon.com/dp/B00HT5HBMO/ref=cm_sw_r_cp_api_i_JPPN342K48XDF1XDD44Q