I have two minis who live in these during the spring, summer and fall and this brand is by far my favorite. I have purchased them all and these are big enough for them to not get rubbed and they have large openings at the top/front for them to breathe. I have a mini who picks up a lot of trash in his muzzles and the grass clumps have to be removed daily or he’d suffocate. I don’t worry as much with this brand. I will say the I have to buy new ones almost every year because mine will wear the plastic down grazing but that happens with every brand I’ve used and I live in a rocky terrain so this may be atypical.