If you prefer a live tree for your Christmas celebration, opt for a fir or spruce over pine. Pine trees aren’t toxic to dogs, but they can be to cats and can cause liver damage and even death. Regardless of tree type, pick up any fallen needles. If ingested, these needles could damage your pet’s internal organs.Click to see full answer. Simply so, are blue spruce trees toxic to dogs?If the pet eats a lot, then the toxicity level increases. Christmas tree oils can ?be irritating to the mouth and stomach, causing excessive drooling or vomiting. Tree needles are not easily digested and may cause gastrointestinal irritation, vomiting, obstruction, or puncture.Similarly, are pine trees toxic to dogs? Pine needles are not particularly toxic, and a large number of them would need to be ingested, which is unlikely, before toxicity would be a concern for your pet. However, they can cause irritation in the mouth and GI tract of your dog due to tree oils they contain, and because of their pointed structure. Likewise, people ask, are evergreens poisonous to dogs? Toxicity to Dogs Whether an evergreen tree is toxic to dogs depends on which type of evergreen tree the dog ingests and sometimes which part of the tree the dog ingests. Trees such as the American holly (Ilex opaca, hardy from USDA zones 5B through 9) are only mildly toxic, causing vomiting and diarrhea.Which plants are poisonous to dogs? There are many house and garden plants that are poisonous to dogs, here are some of the most common ones: Aconitum. Amaryllis bulbs. Asparagus fern. Azalea. Cyclamen. Daffodil bulbs. Day lilies. Delphiniums.