When are spaniels fully grown?

Spaniels typically reach their full adult size and maturity between 1 to 2 years of age, depending on the specific breed. Smaller breeds, like the Cavalier King Charles Spaniel, tend to mature faster, while larger breeds, such as the English Springer Spaniel, may take longer. It's important to note that full emotional and behavioral maturity may take a bit longer, often extending into the 2-3 year range. Regular exercise and proper training during this period are crucial for their development.