Measure back length, chest girth and neck circumference, then match those numbers to the exact brand’s UK dog coat size chart before buying.
Record back length, chest girth and neck circumference with the dog standing. Then stop using generic size labels and open the chart for the exact coat model.
That second step matters because makers prioritise different numbers. Hurtta says jacket size is determined by back length; Ruffwear sizes the Overcoat Fuse by rib-cage girth; Ancol asks for the closest coat length plus a girth check; Barbour uses its own length and width system.
This page cannot promise a correct fit in five minutes. It gives a repeatable starting point and the model-specific rule needed before ordering.
Back length: from the base of the neck or shoulder line to the base of the tail, following the exact maker diagram.
Chest girth: around the widest part of the rib cage, usually just behind the front legs.
Neck: around the coat’s intended neck line; confirm the landmark in the exact chart.
Then: compare all requested measurements and use that model’s between-size instruction — not a site-wide “size up” rule.
These current maker instructions show why one blanket between-size rule would be wrong.
| Exact model or family | Primary published measure | Between-size rule | Extra check |
|---|---|---|---|
| Hurtta Monsoon Coat II ECO | Back length determines jacket size | Choose the larger size | Compare neck and chest ranges and select the exact standard or XS body-shape variant |
| Ruffwear Overcoat Fuse Dog Vest | Girth around widest rib-cage point | Choose the smaller size | Check published back and neck dimensions for that girth band |
| Ruffwear Powder Hound Dog Jacket | Girth around widest rib-cage point | Choose the larger size | Formfitting sleeved design; check published back and neck dimensions |
| Ancol Stormguard Dog Coat | Back length plus chest girth | Choose closest coat length, then confirm girth | Do not transfer the classic chart to Soft Shell or Ultimate Reflective variants |
| Barbour Quilted Dog Coat | Neck-to-tail plus model-specific widths and strap length | No universal between-size rule found | Use the current Barbour chart; do not assume every variant is 45.4cm long |
| Trespaws Seadog | Generic chart lists weight, back, torso and neck caps | No reliable universal rule found | Do not choose by weight alone; the live chart contains gaps and overlapping bands |
Stand the dog on a flat surface in a normal posture. Use a flexible tape and write each result in centimetres. PDSA describes length from the neck to the tail base, chest just behind the front legs and the neck where the collar sits.
Back length: follow the maker’s start point at the base of the neck or shoulder line and measure along the back to the tail base. Do not measure the whole dog from nose to tail.
Chest girth: pass the tape around the widest rib-cage point, keeping it flat and following the maker illustration. Record the actual number rather than converting it to “medium”.
Neck circumference: measure at the neck line shown for the selected coat. A high-neck shell may use a different landmark from everyday collar fit.
Repeat the measurements and use the exact chart. If one number is close to a boundary, keep the recorded number rather than rounding it to force a preferred size.
Two dogs of the same weight can have different back length, rib-cage girth and neck proportions. A breed name is also only a rough shape clue, not a substitute for the individual measurements.
Hurtta publishes standard and XS shapes in some back lengths, Ruffwear publishes girth bands plus garment dimensions, and Ancol asks buyers to compare length and girth. Those chart details are more useful than labelling a dog “medium-large”.
If the recorded dimensions do not sit safely inside one size band, contact the manufacturer or retailer with the exact model and measurements before ordering. Do not solve a chart conflict by automatically choosing the larger size.
Hurtta says the Monsoon II ECO jacket size is determined by back length and to choose the larger size between measurements. Ruffwear says to choose the smaller Overcoat Fuse size between girth bands, while its Powder Hound page says to choose the larger size.
Barbour’s guide uses neck-to-tail length, top mid-width, tab-to-cheek length and underside width for relevant designs. It does not justify a blanket claim that every Barbour coat runs small.
The correct action is therefore model-specific: preserve the numbers, compare every relevant column and follow the rule printed for that exact design.
Before removing tags or using the coat outdoors, check it in the normal standing and walking posture. The dog should be able to turn, walk, lie down and toilet without the garment pulling, rubbing or covering the wrong area.
PDSA advises that a dog should be able to run, jump and toilet normally in a coat, and notes that biting, scratching or rubbing at it can signal irritation. Ancol also says fit should not restrict movement or breathing.
For a coat over a harness, repeat the check with the exact harness underneath and make sure the access point aligns without pulling either layer. Return or exchange a poor fit rather than trying to make an incompatible size work.
Start with back length, chest girth and neck circumference. Then check whether the exact model also requests width, garment length, weight or another dimension.
Not automatically. Hurtta says larger for the Monsoon II ECO, Ruffwear says smaller for the Overcoat Fuse and larger for the Powder Hound. Follow the exact model rule.
These three models illustrate different sizing systems. The links are size-selectable Amazon searches, not endorsements of whichever result appears first.
Open this exact-model search only after matching back length, neck and chest to the Monsoon II ECO chart; require “II ECO” rather than the retired Monsoon generation.
Open this exact-model search only after measuring the widest rib-cage point and checking the published back and neck dimensions for the selected girth band.
Match neck-to-tail length and the relevant width and strap measurements to the DCO0004 chart before opening this exact-model search.
Start with back length, chest girth and neck circumference. Then check whether the exact model also requests width, garment length, weight or another dimension.
Not automatically. Hurtta says larger for the Monsoon II ECO, Ruffwear says smaller for the Overcoat Fuse and larger for the Powder Hound. Follow the exact model rule.
No. Weight does not describe back length, rib-cage girth or body shape. Use it only as an additional field when the exact chart asks for it.
Barbour’s current guide asks for neck-to-tail length and model-dependent top, underside and fastening measurements. Use its centimetre chart for the exact coat rather than a generic S/M/L conversion.
Check normal movement, breathing, toileting and rubbing. PDSA says the dog should still be able to run, jump and toilet normally; biting, scratching or rubbing at the coat can indicate irritation.
Optional extras that may help with the task on this page. Check size, compatibility and care instructions before buying; these are category searches, not products tested by Dog Product Reviews.
A soft centimetre tape can follow the back, rib cage and neck without turning the measurement into a straight-line estimate.
Typically under £15
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