Pet Size & Weight Charts

For purebred pets, breed standards provide weight and size ranges. For mixed breeds, genetics from parents offer the best prediction. Our size charts show typical adult sizes by breed and species. Most pets reach their full size by 12-18 months, though giant dog breeds may continue growing until 24 months.

Adult size affects habitat requirements (cage, crate, living space), food costs (larger pets eat more), veterinary expenses, exercise needs, and suitability for your living situation. Planning for adult size helps ensure you can provide proper care throughout your pet's life.

Growth completion varies by species and breed. Small dogs finish growing by 10-12 months, large dogs by 18-24 months. Cats typically reach full size by 12-18 months. Rabbits finish growing by 6-9 months, while guinea pigs reach adult size by 8-12 months. Select your species above for specific growth timelines.

If your pet deviates significantly from breed size standards, consult your veterinarian. Underweight pets may have health issues, parasites, or nutritional problems. Overweight pets face increased health risks. Your vet can help determine if your pet's size is healthy for their individual build and genetics.