it's been an ongoing issue for a MONTHS now.
I order pretty much all sizes, pups, weaned, smalls, mediums, lrgs and XLs. The last two months I've had to split orders between various suppliers to make sure I can get everything. It is very annoying and shipping is costly.
I usually go with Laynes or Big Cheese, I've been filling in with Perfect Prey lately as well.
I really hope these shortages/out of stock issues are resolved soon