itchpet.com

Great service from the start. I was very touched when I informed them that one of my cats had died, and I received a lovely email from them.

Always delivered on time

Here first delivery was fast and second was on time :)

Great service and app for tracking or changing requirements, easy to use.

The monthly delivery, when this treatment started, was usually received around 16th if the month. It is now around 20th-22nd if the month. Maybe while there is an ongoing postal strike you could send the products out a few days earlier.