It is recommended to breed females during their second heat. She should be at least two years old also.
about one year old
At least 15 months of age.
about 13 through 15
At least 15 months of age.
She should be at least more than 5 month old.
around 5, because the dog will get old, and the hips on the dog aren't that good for breeding, and mounting! you should wait before 1-4 for breeding!
Dogs should be at least one year of age and in good health before breeding. In my opinion, one litter a year is healthy for a dog. And breeding should stop when they are over 6 years old.
3 years of age to start breeding
Male dogs should be at least a year old before breeding; however, it is best to wait for about a year longer (as long as it takes to get out of the "teenager" stage) so you can find the dog's temperament. This is so you don't pass along aggressive or overly submissive traits.
Your cockatiels should be at least a year old before you start breeding them to prevent ill offspring.
At least 12 months of age.
As long as the Sheltie is socialized.