Good morning, the insulating panels can be removed for the summer or fixed? As size is fine for medium-sized dogs (labrador)?

The insulation kit in the doghouse NEGUS PLUS consists of panels from 10 mm thickness that are cut to size and attached to the inside of the kennel during the production phase.
If necessary, the panels can be easily removed, unscrew the fixing screws and then extract them from the top.
In any case the advantage of the insulation layer consists of a high thermal insulation so that in winter the inside of the nest is kept warmer in summer while the insulation kit keeps the kennel fresher.
As for the measures for a Labrador is fine, however it can also refer to our brief guide to the choice of the kennel:
GUIDE CHOICE FOR DOG KENNEL