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Pet nutrition & care glossary

Short definitions of the terms used in our calculators, from RER and MER to body condition score and dry matter basis.

A
As-fed basis
Nutrient percentages exactly as printed on the label, including the water in the food.
B
Body Condition Score (BCS)
A 1–9 scale (WSAVA) that describes body fat by sight and touch; 4–5 is ideal.
Brachycephalic
Short-nosed breeds such as Pugs and French Bulldogs; they overheat more easily.
C
Core vaccine
A vaccine recommended for every dog or cat regardless of lifestyle, such as canine parvovirus or feline panleukopenia.
D
Dry matter basis
Nutrient percentages recalculated without water so wet and dry foods can be compared.
E
Estrus
The part of a female dog's heat cycle when she accepts mating and can conceive.
G
Gestation
The length of pregnancy — about 63 days in dogs and 63–65 days in cats.
Guaranteed analysis
The label panel listing minimum protein and fat and maximum fibre and moisture.
I
Ideal body weight
The weight at which a pet would have a body condition score of 4–5.
K
kcal
Kilocalorie — the unit pet food energy is labelled in (the same as a dietary 'Calorie').
L
Life stage
Growth, adult, senior, pregnancy or lactation; each changes energy needs.
M
MER
Maintenance Energy Requirement: daily calories for a normal day, calculated as RER × a life-stage factor.
Modified Atwater factors
3.5 kcal/g for protein and carbohydrate and 8.5 kcal/g for fat, used to estimate pet food energy (NRC 2006).
N
NFE (nitrogen-free extract)
An estimate of carbohydrate: 100 minus protein, fat, fibre, moisture and ash.
Non-core vaccine
A vaccine given only when lifestyle or location puts a pet at risk.
P
Polydipsia
Drinking much more than normal — in dogs, more than about 100 mL per kg per day.
Proestrus
The first stage of a dog's heat, about 9 days, with swelling and bloody discharge.
R
RER
Resting Energy Requirement: 70 × body weight (kg)^0.75 kcal per day.
S
Size class
Small (≤ 9 kg), medium (9–23 kg), large (23–41 kg) or giant (> 41 kg) adult weight, as used in our dog-age calculator.
W
Whelping / queening
Giving birth in dogs (whelping) and cats (queening).