What he wants to say is "Yukkuris without owner is SHIT even if they are pedigree and expensive". This is a very very critical fact for them because they would be thrown away as same as dust if they weren't bought, and they are so proud of themselves. Who is going to buy such a self-conceit pets...
He did tell the little frozen food types not to listen to the pets. It could be he wants to educate the food types too since he did say something about adhering to a promise in exchange for taking them outside.
Same signs as previous panel, and I still can't read Alice's sign."All these yukkuris don't.""--You two have me."