Boxer: crate, bed and harness size
AKC weight: 65-80 pounds (male); females about 15 pounds less (AKC Boxer breed page). The Boxer is #18 in AKC's 2025 ranking (AKC).
Crate: 42" crate (MidWest iCrate Dog Crate Size Guide (manufacturer PDF))
Bed: Large rectangle bed (43 x 29 in) (Orvis Dog Product Sizing Guide (Rectangle bed))
Harness: Measure your dog's chest girth, then check the Ruffwear girth chart. No breed standard lists girth.
Photo: Mood210, CC BY-SA 3.0, via Wikimedia Commons (cropped).