Take  to your vet --- could be anal gland needs to be popped. Look it up and it'll explain to you what exactly it is.it happens to small dogs. It's not a bad thing but you DO have to get it takin care of A.S.A.P.  Is VERY uncomfotable for your dog,     OR she can have her period.    Go to vet.

You have to take your kitten to the vet A.S.A.P.  That is not good that it is vomiting them up. One thing it means is that it's belly's so full with worms that it's like over loaded and pouring out it's mouth in other words.and the worms are living off of the food the kitten's eating. … Read more

Not really sure of what age,BUT I do know that you are only supposed to breed a dog--2--times,and that is all,you're not supposed to breed them more than that.and with a small breed your not to mate them with any bigger dog cause it'll hurt their insides.and it can kill them. Bye,jamie