my dog i about 6 months old she only had her first set of shots. she is throwing up frequently. foam like vomit. she has diarrhea. it is liquid but no blood. she doesnt feel like she had a fever. her nose is cool. she is very lathargic and appears stiff. does she have parvo? if she does what can i do at home to save her i have no money to take her to the vet. if it is something else what can i do? please help her she is miserable.