Hi. My 6 mo. old grandson has an issue: they got a Golden Retriever pup in December. There is already a dog in the house. He began showing pink eye-type symptoms in early Dec.. usual meds did nothing, but he began to have respiratory issues, too. His doctor began a week of Claritin (no improvement), followed by a week of Zyrtec. Minimal improvement. As the respiratory issues began at about the same time that they brought their Christmas tree into the house, is it possible he is having a reaction to that and not to the dog?