All Tools

50 calculators for older dogs. Each one runs on a published veterinary formula, a peer-reviewed dataset, or a manufacturer's own size chart, and each page names its source. Where the underlying evidence is thin or disputed, the tool says so instead of rounding it into a number.

Getting around

• Harness Finder — Match a harness type and size to your dog's weight, girth, and condition.
• Ramp Length Calculator — The ramp length a given rise needs to stay at a gentle angle.
• Ramp Angle Checker — You already own a ramp — measure it and find out if it's too steep.
• Ramp or Stairs? — Which suits your dog's condition, and whether a ramp fits the space.
• Pet Stairs Height Calculator — How many steps a rise needs, and which stairs are tall enough.
• Wheelchair Size Calculator — The Walkin' Wheels band for your dog's weight, and what custom makers need.
• Harness Size Converter — One brand's size translated to the brands whose charts can be compared.
• Stair Safety Check — Your staircase measured against building code limits and your dog's condition.

Paw and nail care

• Boot Size Calculator — Ruffwear sizes by paw width, Muttluks by paw length — both at once.
• ToeGrips Size Calculator — Nail circumference to the matching Dr. Buzby's ToeGrips size.
• Floor Traction Calculator — How much runner rug covers the slippery paths your dog walks.

Beds, crates and home

• Bed Size Calculator — The minimum orthopedic bed length that leaves room to stretch out.
• Crate Size Calculator — Everyday crate sizing from your dog's length and weight.
• Post-Op Crate Size — Confinement sizing after surgery — a minimum that fits and a ceiling that limits movement.
• Pet Door Size Calculator — Flap size from your dog's shoulder height and width.
• Car Harness Size — Crash-test harness sizing by chest girth.
• Home Safety Checklist — What to change first, ordered by your dog's condition and your layout.
• How to Measure Your Dog — Which measurement each product category needs, and where brands differ.

Food and weight

• Calorie Calculator — Daily calorie needs from resting energy requirement and activity.
• Food Portion Calculator — Daily calories converted to cups or grams of your food.
• Weight Loss Calculator — Target calories and how long a safe loss actually takes.
• Weight Loss Tracker — Your weigh-ins against the safe rate of loss.
• Ideal Weight Calculator — Body condition score to how much over ideal your dog is.
• Water Intake Calculator — Normal daily water, and the level that's worth a vet visit.
• Treat Budget Calculator — How many treats fit in the day's calories.
• Food Cost Comparison — Two foods compared by cost per 1,000 calories, not by bag price.
• Food Calorie Converter — kcal per kg, per cup, and per can, converted.
• Food Storage Size — How much food a month weighs, and what container holds it.
• Omega-3 Dose Calculator — EPA and DHA by body weight, with the published safety ceiling.
• Fish Oil Capsule Calculator — Your bottle's label converted to capsules per day.

Age and life expectancy

• Dog Age in Human Years — The epigenetic formula, and why the multiply-by-seven rule is wrong.
• Age From Date of Birth — Exact age, life stage, and whether your dog counts as senior yet.
• When Is a Dog Senior? — The last-quarter-of-lifespan rule applied to your dog's size.
• Life Expectancy by Size — Median lifespan for small, medium and large dogs.
• Life Expectancy by Breed — Median lifespan for 155 breeds, from a 584,734-dog study.
• Lifespan Percentile — Where your dog's current age sits on the survival curve.

Breed risk

• Arthritis Risk by Breed — Odds of arthritis by breed against crossbred dogs.
• IVDD Risk by Breed — Disc disease prevalence in dachshunds and the breeds carrying the FGF4 insertion.
• Degenerative Myelopathy Risk — SOD1 mutation frequency across 65 breeds, and what a result does and doesn't mean.
• Bone Cancer Risk by Breed — Osteosarcoma prevalence and odds by breed.

Pain and quality of life

• Canine Brief Pain Inventory — The published chronic pain questionnaire, scored, with the treatment-response threshold.
• Quality of Life Log — Seven everyday domains tracked over time, to bring to your vet.

Costs

• Yearly Vet Cost — Annual veterinary spend built from national per-visit averages.
• Monthly Budget — Food, vet and medication added up per month.
• Lifetime Cost — What a dog costs over a lifetime, against what owners expect.
• Is Insurance Worth It? — Premiums against expected claims, including what a senior policy won't cover.
• Surgery Cost Estimator — Price ranges for TPLO, disc surgery and hip procedures.
• Wheelchair Cost Comparison — Ready-made against custom-built carts.
• End-of-Life Costs — Euthanasia and cremation price ranges, and how uncertain the published figures are.

Conversions

• Pounds to Kilograms — Weight converted, and what changes at each size class.