My 1.5-year-old female dog hasn't had her first heat. Can she breed?

She could still go into heat at any time. Some dogs go into heat later than others, although smaller breed dogs tend to go into heat by a year of age. It could also be that she has gone into heat, but it was a silent heat so you didn't notice any signs of it. I'd have her checked out by a vet to be safe. Best of luck.

Some pets can be a bit delayed with their first heat cycle. I wouldn’t be concerned about her not being able to have a litter just yet. Give her until she is about 10 months of age and if she hasn’t had a heat cycle by then, it wouldn’t hurt to get her examined by your vet to look into possible underlying causes, especially if you are certain she hasn’t already been spayed. Best of luck with your pup Sadie moving forward. Take care.

They will never ne as large as their brother being female. Sometimes the first heat can be silent in that you dont see any outward sign. I would keep a close eye now as their second heat should be imminent.

I'm wondering if you mean that Belle has an underbite. This can be common in breeds such as the Shih Tzu. As for not being in heat yet, she can go into heat anytime, so I would not worry about her being nine months and not having a heat yet. It can take up to a year of age before she goes into heat. I wouldn't be worried that there is a problem with her reproductive system. Best of luck, I hope this helps!

Typically dogs do have a heat every six months, but it could be Cleo had a heat and it was a silent heat. Silent heats are when the dog shows no outward signs of being in heat. You can have her checked out by a vet to be safe. Best of luck.

Yes, it can be normal. Often times though, they have gone into heat, you just didn't notice. Some dogs keep their vulva clean so you don't notice any bleeding. If you are worried then I suggest you take her to your vet for a breeding soundness examination.

She may be extremely clean and you might not notice when she is in heat. If you intend to breed her I suggest you have her examined by a theriogenologist or veterinarian specialised in dog breeding . She may not be cycling due to ovarian cysts, or may be missing ovaries, or have hormonal problems.