Microplastics shouldn’t make the list of things to worry about here.

For one, we don’t really know how/why microplastics are bad, or how bad. If they have significant bad effects, the mechanism is slow and subtle, so unlikely to affect dogs (who, very sadly, just don’t live that long).

Second, the incremental increase in microplastics from this device would be very tiny compared to typical exposure estimates.

When you balance the very small risk against a tangible benefit, they answer is clear.