re: Something is wrong with my dog

Likely. I hit the panic button when you said pale mucous membranes. I should have had you clarify right away until later in the topic.

Pale, in my work, equals almost white - like the kind of white that your gums turn when you press on them real hard. A dog with pale gums won't be able to see a difference when you press on them

Pale Pink -- this kind of a grey area. Soem dogs walk around all day every day with pale pink gums. Could be an indicator of a disease or not.

I think with pale pink or pink gums, normal respiration, normal pulse you may be able to watch him til tomorrow (as with all things in life you assume some risk by waiting).

You can feel the upper, inside part of his back leg for his femoral pulse and count it the same way as you did the respirations. Should be between around 90-150 beats per minute