My chihuahua dog is 8 and 1/2 yrs old and got pregnant by a mimituer poddle. Is she in any risk?

I would be afraid of it. You should talk to your vet. Since such accidental breedings often cause injuries, you should have had her examined. At her age, any delivery might be difficult. You may want to plan a caesarian.

These things wouldn't happen if people that aren't serious about breeding would spay/neuter their pets. At 8 1/2, she is past where responsible people breed females.

How do we know if she is pregnant