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It sounds like your dog does have an eye infection. You can flush the eyes with saline and then dry them well with a clean, dry towel. If the gunk comes right back, you are dealing with an infection and you need to see the vet for antibiotics.
You don't want to take any chances with a Peke's eyes as they have inherited problems already that are specific to the breed.
Let me know if you still have questions.
I am so sorry that you had a tough night. When you see the vet, you have the right to refuse any tests that you think are unnecessary.
But keep in mind that your vet would not recommend them if he didn't feel like they were needed.