is it possible to combine animal DNA with human DNA? if not, why and would it be possible to get around whatever reason its impossible?

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Yes and no. It depends on the animal. DNA is composed of strand levels, for example, human DNA can be like: GGG-HHH-KKK-LLL-SSS. Most animals, or all living things, will have GGG, and the closer an animal is related to human, the more strands it will have. So, for instance: Horse DNA: GGG-HHH-KKK-PPP-QQQ. Human DNA: GGG-HHH-KKK-LLL-SSS. You can combine the first three levels because they are the same. And in case you're wondering, monkeys/apes/primates have the exact genetic DNA code of humans.

Yes it's possible. All living things on this planet use the same basic code (with the few exceptions having one or two different "codons," kind of like British people spelling color "colour"). Using special enzymes that can cut DNA and others that can put cut pieces together, you can combine DNA from two different organisms. You can also use viruses to transfer DNA into a cell. There's been many cases of putting human DNA into bacteria. For example, insulin for diabetics is made by bacteria that were given the human gene for it.  That way, it works in our bodies and won't cause allergies. The challenge is getting the foreign DNA into a cell without disrupting the cell's normal activities and causing cancer/death. That's why it's been done to things like bacteria or plants (few people care if 1000's of bacteria die in a petri dish), but I don't think anyone has tried to put animal DNA into a human. They've tried to fix diseases putting "good" human DNA into people with mixed results